7Baggers

Cognex Corporation
(NASDAQ:CGNX) 

CGNX stock logo

Cognex Corporation provides machine vision products that capture and analyze visual information in order to automate manufacturing and distribution tasks worldwide. Its machine vision products are used to automate the manufacturing and tracking of discrete items, including mobile phones, aspirin bot...

Founded: 1981
Full Time Employees: 2,267
Sector: Technology
Industry: Scientific & Technical Instruments

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    Unit: USD2026-04-05 2025-12-31 2025-09-28 2025-06-29 2025-03-30 2024-12-31 2024-09-29 2024-06-30 2024-03-31 2023-12-31 2023-10-01 2023-07-02 2023-04-02 2022-12-31 2022-10-02 2022-07-03 2022-04-03 2021-12-31 2021-10-03 2021-07-04 2021-04-04 2020-12-31 2020-09-27 2020-06-28 2020-03-29 2019-12-31 2019-09-29 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-07-01 2018-04-01 2017-12-31 2017-10-01 2017-07-02 2017-04-02 2016-12-31 2016-10-02 2016-07-03 2016-04-03 2015-12-31 2015-10-04 2015-07-05 2015-04-05 2014-12-31 2014-09-28 2014-06-29 2014-03-30 2013-12-31 2013-09-29 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-07-01 2012-04-01 2011-12-31 2011-10-02 2011-07-03 2011-04-03 2010-12-31 2010-10-03 2010-07-04 2010-04-04 2009-12-31 2009-10-04 2009-07-05 2009-04-05 2008-12-31 2008-09-28 2008-06-29 2008-03-30 2007-12-31 2007-09-30 2007-07-01 2007-04-01 2006-12-31 2006-10-01 2006-07-02 2006-04-02 2005-10-02 2005-07-03 2005-04-03 2004-10-03 2004-07-04 2004-04-04 2003-09-28 2003-06-29 2003-03-30 2002-09-29 2002-03-31 2001-12-31 
                                                                                                 
      revenue
    268,437,000 252,338,000 276,892,000 249,093,000 216,036,000 229,684,000 234,742,000 239,292,000 210,797,000 196,670,000 197,241,000 242,512,000 201,124,000 239,433,000 209,622,000 274,628,000 282,407,000 244,065,000 284,848,000 269,158,000 239,027,000 223,615,000 251,073,000 169,097,000 167,235,000 169,769,000 183,325,000 199,047,000 173,484,000 193,286,000 232,221,000 211,264,000 169,567,000 180,365,000 259,739,000 172,904,000 134,942,000 129,322,000 147,952,000 147,274,000 96,205,000 97,768,000 107,587,000 143,829,000                                                  
      yoy
    24.26% 9.86% 17.96% 4.10% 2.49% 16.79% 19.01% -1.33% 4.81% -17.86% -5.91% -11.69% -28.78% -1.90% -26.41% 2.03% 18.15% 9.15% 13.45% 59.17% 42.93% 31.72% 36.96% -15.05% -3.60% -12.17% -21.06% -5.78% 2.31% 7.16% -10.59% 22.19% 25.66% 39.47% 75.56% 17.40% 40.27% 32.27% 37.52% 2.40%                                                      
      qoq
    6.38% -8.87% 11.16% 15.30% -5.94% -2.15% -1.90% 13.52% 7.18% -0.29% -18.67% 20.58% -16.00% 14.22% -23.67% -2.75% 15.71% -14.32% 5.83% 12.61% 6.89% -10.94% 48.48% 1.11% -1.49% -7.39% -7.90% 14.74% -10.24% -16.77% 9.92% 24.59% -5.99% -30.56% 50.22% 28.13% 4.35% -12.59% 0.46% 53.08% -1.60% -9.13% -25.20%                                                   
      cost of revenue
    77,498,000 86,434,000 89,602,000 81,217,000 71,713,000 71,825,000 75,343,000 72,693,000 68,860,000 61,626,000 54,467,000 62,829,000 57,384,000 69,869,000 57,383,000 78,143,000 78,790,000 69,082,000 85,712,000 68,432,000 54,045,000 55,160,000 59,741,000 50,320,000 41,200,000 44,871,000 47,632,000 50,967,000 46,284,000 52,825,000 58,860,000 54,169,000 40,198,000 40,642,000 62,360,000 37,471,000 28,225,000 26,660,000 32,749,000 35,213,000 20,968,000 23,400,000 26,319,000 30,508,000                                                  
      gross profit
    190,939,000 165,904,000 187,290,000 167,876,000 144,323,000                                                                                         
      yoy
    32.30%                                                                                             
      qoq
    15.09% -11.42% 11.56% 16.32%                                                                                          
      gross margin %
    71.13% 65.75% 67.64% 67.39% 66.81% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN%  
      research, development, and engineering expenses
    37,025,000 36,060,000 35,081,000 33,102,000 34,727,000 32,538,000 35,210,000 34,962,000 37,105,000 34,693,000 32,580,000 33,585,000 38,542,000 37,134,000 33,954,000 33,991,000 36,054,000 35,489,000 34,476,000 31,302,000 34,105,000 34,399,000 30,240,000 30,397,000 35,946,000 32,991,000 28,115,000 28,079,000 30,242,000 28,781,000 29,700,000 26,888,000 31,076,000 26,980,000 26,078,000 23,377,000 22,770,000 19,440,000 18,603,000 19,671,000 20,555,000 17,526,000 16,977,000 18,302,000 18,076,000 15,254,000 18,542,000 13,622,000 12,502,000 12,695,000 12,184,000 11,887,000 11,321,000 10,886,000 10,002,000 10,300,000 10,361,000 10,350,000 10,608,000 10,506,000 9,482,000 8,940,000 7,961,000 8,076,000 8,103,000 7,837,000 6,756,000 7,704,000 8,835,000 8,970,000 9,073,000 9,290,000 9,097,000 9,681,000 8,704,000 8,019,000 7,931,000 8,111,000 7,997,000 8,582,000 7,917,000 7,224,000 7,185,000 6,315,000 6,552,000 6,655,000 6,898,000 6,246,000 6,263,000 5,983,000 6,714,000 6,352,000  
      selling, general, and administrative expenses
    94,041,000 94,568,000 94,444,000 91,341,000 83,504,000 94,481,000 92,625,000 93,180,000 90,628,000 90,372,000 82,307,000 83,423,000 83,037,000 75,951,000 75,371,000 79,950,000 80,835,000 82,974,000 77,113,000 76,843,000 72,424,000 74,096,000 64,206,000 60,153,000 69,138,000 74,300,000 64,486,000 68,245,000 66,811,000 66,433,000 65,817,000 66,752,000 63,697,000 60,635,000 61,054,000 52,518,000 46,521,000 42,985,000 42,072,000 42,715,000 38,338,000 37,694,000 35,806,000 43,241,000 43,487,000 41,040,000 47,059,000 38,668,000 34,900,000 36,007,000 33,877,000 33,300,000 32,167,000 30,387,000 28,765,000 30,127,000 30,549,000 30,932,000 28,135,000 29,466,000 29,161,000 29,018,000 25,857,000 25,738,000 23,622,000 26,524,000 21,281,000 22,404,000 26,141,000 29,267,000 28,788,000 28,048,000 26,528,000 26,949,000 24,303,000 24,594,000 23,973,000 24,208,000 23,414,000 25,277,000 23,779,000 21,351,000 21,494,000 17,508,000 18,099,000 17,568,000 16,314,000 13,761,000 13,949,000 13,871,000 15,442,000 13,025,000  
      operating income
    59,873,000 35,276,000 57,765,000 43,433,000 26,092,000 30,840,000 31,564,000 38,457,000 14,204,000 12,729,000 30,637,000 65,175,000 22,161,000 54,337,000 40,023,000 65,141,000 86,728,000 56,520,000 87,547,000 92,581,000 78,453,000 59,085,000 96,635,000 -6,142,000 20,951,000 17,607,000 43,092,000 51,756,000 30,147,000 45,247,000 77,844,000 63,455,000 34,596,000 52,108,000 110,247,000 59,538,000 37,426,000 40,237,000 54,528,000 49,675,000 16,344,000 19,148,000 28,485,000 51,778,000 23,917,000 31,070,000 59,428,000 30,722,000 22,443,000 24,835,000 23,379,000 20,173,000 17,981,000 20,513,000 21,803,000 23,350,000 17,741,000 21,556,000 22,389,000 24,042,000 17,368,000 22,945,000 22,275,000 19,241,000 11,252,000 756,000 880,000 -7,854,000 -6,450,000 -1,612,000 7,987,000 10,726,000 7,818,000 11,227,000 7,120,000 4,148,000 4,604,000 9,793,000 11,147,000 12,622,000 10,634,000 13,926,000 9,859,000 5,585,000 15,875,000 14,339,000 10,168,000 5,507,000 4,411,000 1,318,000 -1,394,000 -6,162,000  
      yoy
    129.47% 14.38% 83.01% 12.94% 83.69% 142.28% 3.03% -40.99% -35.91% -76.57% -23.45% 0.05% -74.45% -3.86% -54.28% -29.64% 10.55% -4.34% -9.40% -1607.34% 274.46% 235.58% 124.25% -111.87% -30.50% -61.09% -44.64% -18.44% -12.86% -13.17% -29.39% 6.58% -7.56% 29.50% 102.18% 19.86% 128.99% 110.14% 91.43% -4.06% -31.66% -38.37% -52.07% 68.54% 6.57% 25.11% 154.19% 52.29% 24.82% 21.07% 7.23% -13.61% 1.35% -4.84% -2.62% -2.88% 2.15% -6.05% 0.51% 24.95% 54.35% 2935.05% 2431.25% -344.98% -274.45% -146.90% -88.98% -173.22% -182.50% -114.36% 12.18% 158.58% 69.81% 14.64% -36.13% -67.14% -56.70% -29.68% 13.06% 126.00% -33.01% -2.88% -3.04% 1.42% 259.90% 987.94% -829.41% -189.37%      
      qoq
    69.73% -38.93% 33.00% 66.46% -15.40% -2.29% -17.92% 170.75% 11.59% -58.45% -52.99% 194.10% -59.22% 35.76% -38.56% -24.89% 53.45% -35.44% -5.44% 18.01% 32.78% -38.86% -1673.35% -129.32% 18.99% -59.14% -16.74% 71.68% -33.37% -41.87% 22.68% 83.42% -33.61% -52.74% 85.17% 59.08% -6.99% -26.21% 9.77% 203.93% -14.64% -32.78% -44.99% 116.49% -23.02% -47.72% 93.44% 36.89% -9.63% 6.23% 15.89% 12.19% -12.34% -5.92% -6.63% 31.62% -17.70% -3.72% -6.88% 38.43% -24.31% 3.01% 15.77% 71.00% 1388.36% -14.09% -111.20% 21.77% 300.12% -120.18% -25.54% 37.20% -30.36% 57.68% 71.65% -9.90% -52.99% -12.15% -11.69% 18.69% -23.64% 41.25% 76.53% -64.82% 10.71% 41.02% 84.64% 24.85% 234.67% -194.55% -77.38%   
      operating margin %
    22.30% 13.98% 20.86% 17.44% 12.08% 13.43% 13.45% 16.07% 6.74% 6.47% 15.53% 26.87% 11.02% 22.69% 19.09% 23.72% 30.71% 23.16% 30.73% 34.40% 32.82% 26.42% 38.49% -3.63% 12.53% 10.37% 23.51% 26.00% 17.38% 23.41% 33.52% 30.04% 20.40% 28.89% 42.45% 34.43% 27.73% 31.11% 36.86% 33.73% 16.99% 19.59% 26.48% 36.00% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% -Infinity%  
      foreign currency gain
    -1,345,000 -966,000 840,000 -1,503,000 -2,453,000 445,000 1,221,000 -181,000 46,000 -129,000 -8,699,000 -1,605,000 394,000 2,530,000 -1,880,000 -2,043,000 -444,000 -37,000 -586,000 -639,000 -1,008,000 4,007,000 2,357,000 336,000 -3,003,000 894,000 -1,295,000 140,000 -248,000 -356,000 -379,000 -195,000 -134,000 -1,027,000 -127,000 -184,000 -263,000 478,000 -607,000 330,000 -100,000 542,000 -40,000 -39,000 405,000 351,000 716,000 -96,000 -110,000   76,000 63,000   -30,000  -20,000 -231,000 210,000  -257,000 102,000   -452,000 1,000 -422,000 -392,000 1,699,000 327,000 -647,000 1,118,000 367,000 353,000      -145,000 -410,000 -291,000 99,000  -50,000 625,000 828,000 -1,164,000     
      investment income
    4,836,000 4,723,000 4,197,000 4,040,000 3,990,000 4,174,000 3,561,000 3,116,000 3,120,000 1,520,000 4,891,000 4,095,000 3,587,000 2,326,000 1,416,000 1,505,000 1,468,000 1,635,000 1,748,000 1,723,000 1,554,000 1,984,000 2,490,000 3,291,000 5,229,000 4,447,000 5,114,000 5,223,000 4,905,000 3,979,000 3,937,000 3,559,000 3,240,000 2,917,000 2,475,000 2,138,000 2,012,000 2,408,000 2,047,000 1,447,000 1,137,000 1,026,000 841,000 957,000 850,000 792,000 776,000 801,000 787,000 501,000 937,000 774,000 392,000 874,000 823,000 1,801,000 972,000 683,000 917,000 697,000 605,000 472,000 384,000 308,000 257,000 310,000 419,000 572,000 884,000 1,492,000 1,875,000 1,757,000 1,977,000                  2,507,000 2,396,000  
      other income
    -1,607,000 5,046,000 61,000 2,092,000 169,000 341,000 209,000 176,000 196,000 234,000 173,000 112,000 73,000 38,000 -214,000 -188,000 -48,000 -171,000 -125,000 -127,000 -168,000 -156,000 -173,000 203,000 -183,000 -27,000 456,000 -144,000 927,000 -121,000 -129,000 -246,000 277,000 6,000 -445,000 -169,000 270,000 68,000 374,000 222,000 207,000 1,033,000 -23,000   -36,500 202,000  -273,000    117,000    3,000     -172,000 -129,000 -156,000 -246,000 -145,000 -158,000 -125,000 1,800,000 327,000 -45,000 29,000 355,000                  119,000 165,000  
      income before income tax expense
    61,757,000 44,079,000 62,863,000 48,062,000 27,798,000 35,800,000 36,555,000 41,568,000 17,566,000 14,354,000 27,002,000 67,777,000 26,215,000 59,231,000 39,345,000 64,415,000 87,704,000 57,947,000 88,584,000 93,538,000 78,831,000 64,920,000 101,309,000 -2,312,000 22,994,000 22,921,000 47,367,000 56,975,000 35,731,000 46,456,250 81,273,000 66,573,000 37,979,000    39,445,000        24,862,000 32,076,000 61,122,000 31,352,000 22,847,000 24,859,000 23,708,000 20,766,000 18,553,000 21,444,000 22,086,000 25,022,000 18,078,000 21,688,000 22,919,000 24,801,000 17,709,000 13,278,750 22,632,000 19,385,000 11,098,000        11,268,000 13,704,000 9,354,000 5,763,000 6,264,000                 
      income tax expense
    10,053,000 11,415,000 45,199,000 7,551,000 4,195,000 7,454,000 6,964,000 5,356,000 5,544,000 3,125,000 8,086,000 10,303,000 600,000 3,920,000 5,365,000 5,514,000 20,371,000 4,412,000 9,684,000 15,940,000 8,983,000 -4,425,000 13,803,000 -1,170,000 2,517,000 -57,406,000 5,682,000 8,226,000 2,627,000 2,994,000 837,000 10,377,000 762,000    -6,210,000        4,360,000 5,445,000 10,722,000 5,404,000 4,341,000 4,326,000 2,981,000 3,946,000 2,970,000 5,200,000 4,281,000 5,255,000 3,796,000 2,589,000 4,882,000 5,704,000 4,073,000 2,874,500 4,487,000 4,458,000 2,553,000        2,793,000 2,610,000 2,011,000 1,936,000 1,629,000                 
      net income
    51,704,000 32,664,000 17,664,000 40,511,000 23,603,000 28,346,000 29,591,000 36,212,000 12,022,000 11,229,000 18,916,000 57,474,000 25,615,000 55,311,000 33,980,000 58,901,000 67,333,000 53,535,000 78,900,000 77,598,000 69,848,000 69,345,000 87,506,000 -1,142,000 20,477,000 80,327,000 41,685,000 48,749,000 33,104,000 45,418,000 80,436,000 56,196,000 37,217,000 -26,897,000 102,348,000 56,072,000 45,655,000 38,253,000 53,675,000 42,759,000 14,885,000 18,746,000 104,112,000 43,714,000 20,502,000 26,631,000 50,400,000 25,948,000 18,506,000 20,443,000 20,727,000 16,820,000 15,583,000 16,244,000 17,805,000 19,767,000 14,282,000 19,099,000 18,037,000 19,097,000 13,636,000 19,764,000 18,145,000 14,927,000 8,545,000 459,000 4,501,000 -6,419,000 -3,410,000 1,814,000 11,333,000 5,653,000 8,475,000 11,094,000 7,343,000 3,827,000 4,635,000 9,505,000 10,116,000 11,434,000 8,800,000 10,858,000 7,800,000 5,294,000 11,655,000 10,878,000 8,567,000 5,138,000 3,306,000 1,793,000 781,000 -2,520,000  
      yoy
    119.06% 15.23% -40.31% 11.87% 96.33% 152.44% 56.43% -36.99% -53.07% -79.70% -44.33% -2.42% -61.96% 3.32% -56.93% -24.09% -3.60% -22.80% -9.83% -6894.92% 241.10% -13.67% 109.92% -102.34% -38.14% 76.86% -48.18% -13.25% -11.05% -268.86% -21.41% 0.22% -18.48% -170.31% 90.68% 31.13% 206.72% 104.06% -48.44% -2.18% -27.40% -29.61% 106.57% 68.47% 10.79% 30.27% 143.16% 54.27% 18.76% 25.85% 16.41% -14.91% 9.11% -14.95% -1.29% 3.51% 4.74% -3.36% -0.60% 27.94% 59.58% 4205.88% 303.13% -332.54% -350.59% -74.70% -60.28% -213.55% -140.24% -83.65% 54.34% 47.71% 82.85% 16.72% -27.41% -66.53% -47.33% -12.46% 29.69% 115.98% -24.50% -0.18% -8.95% 3.04% 252.54% 506.69% 996.93% -303.89%      
      qoq
    58.29% 84.92% -56.40% 71.63% -16.73% -4.21% -18.28% 201.21% 7.06% -40.64% -67.09% 124.38% -53.69% 62.78% -42.31% -12.52% 25.77% -32.15% 1.68% 11.10% 0.73% -20.75% -7762.52% -105.58% -74.51% 92.70% -14.49% 47.26% -27.11% -43.54% 43.13% 51.00% -238.37% -126.28% 82.53% 22.82% 19.35% -28.73% 25.53% 187.26% -20.60% -81.99% 138.17% 113.22% -23.01% -47.16% 94.23% 40.21% -9.48% -1.37% 23.23% 7.94% -4.07% -8.77% -9.93% 38.40% -25.22% 5.89% -5.55% 40.05% -31.01% 8.92% 21.56% 74.69% 1761.66% -89.80% -170.12% 88.24% -287.98% -83.99% 100.48% -33.30% -23.61% 51.08% 91.87% -17.43% -51.24% -6.04% -11.53% 29.93% -18.95% 39.21% 47.34% -54.58% 7.14% 26.98% 66.74% 55.41% 84.38% 129.58% -130.99%   
      net income margin %
    19.26% 12.94% 6.38% 16.26% 10.93% 12.34% 12.61% 15.13% 5.70% 5.71% 9.59% 23.70% 12.74% 23.10% 16.21% 21.45% 23.84% 21.93% 27.70% 28.83% 29.22% 31.01% 34.85% -0.68% 12.24% 47.32% 22.74% 24.49% 19.08% 23.50% 34.64% 26.60% 21.95% -14.91% 39.40% 32.43% 33.83% 29.58% 36.28% 29.03% 15.47% 19.17% 96.77% 30.39% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity%  
      net income per weighted-average common and common-equivalent share:
                                                                                                 
      basic
    310 190 110 240 140 170 170 210 70 70 110 330 150 320 200 340 390 310 450 440 400 400 500 -10 120 470 240 280 190 252.5 470 330 210    530                                    200 260 170 90 100 210 230 250 190 230 170 110 260 240 190  80     
      diluted
    310 200 100 240 140 170 170 210 70 60 110 330 150 320 190 340 380 300 440 430 390 390 490 -10 120 450 240 280 190 245 450 320 210    510                                    200 250 170 90 100 210 220 240 180 220 170 110 250 230 180  80     
      weighted-average common and common-equivalent shares outstanding:
                                                                                                 
      basic
    166,514,000 168,049,000 167,840,000 167,886,000 169,265,000 171,438,000 171,519,000 171,568,000 171,692,000 172,249,000 172,169,000 172,429,000 172,624,000 173,407,000 173,256,000 173,507,000 174,146,000 176,463,000 176,812,000 176,626,000 176,288,000 173,489,000 173,943,000 172,283,000 172,408,000 171,194,000 170,744,000 171,318,000 171,098,000 172,333,000 172,189,000 172,370,000 173,280,000 173,287,000 86,617,000 86,639,000 86,323,000 85,338,000 85,460,000 85,107,000 84,943,000 86,296,000 86,303,000 87,199,000 86,764,000 86,858,000 86,963,000 86,782,000 86,879,000 86,946,000 87,339,000 43,522,000 43,261,000 42,833,000 42,912,000 42,851,000 42,570,000 41,859,000 42,128,000 41,842,000 41,336,000 39,924,000 39,729,000 39,683,000 39,667,000 39,659,000 39,662,000 39,656,000 39,655,000 41,437,000 41,347,000 41,942,000 42,978,000 43,725,000 43,286,000 43,857,000 44,434,000  44,825,000 46,331,000 46,922,000 46,931,000 46,286,000 46,235,000 44,928,000 44,881,000 44,512,000  42,749,000     
      diluted
    168,386,000 169,367,000 169,323,000 168,563,000 170,391,000 172,611,000 172,753,000 172,733,000 172,594,000 173,399,000 173,354,000 173,622,000 173,903,000 174,869,000 174,327,000 174,993,000 176,668,000 179,916,000 180,342,000 179,991,000 179,971,000 176,592,000 177,138,000 172,283,000 175,602,000 175,269,000 174,449,000 175,448,000 175,607,000 177,406,000 177,245,000 177,149,000 179,641,000 179,551,000 89,677,000 89,614,000 89,177,000 87,072,000 87,346,000 86,806,000 86,541,000 87,991,000 87,776,000 89,185,000 88,749,000 89,071,000 89,167,000 88,965,000 89,259,000 88,901,000 89,359,000 44,357,000 44,130,000 43,640,000 43,629,000 43,601,000 43,590,000 42,762,000 42,976,000 42,810,000 42,286,000 40,297,000 39,917,000 39,793,000 39,683,000 39,659,000 39,666,000 39,656,000 39,655,000 41,554,000 41,462,000 42,588,000 43,116,000 44,063,000 43,506,000 44,281,000 44,905,000  45,682,000 47,517,000 48,419,000 48,469,000 47,141,000 47,181,000 46,415,000 47,241,000 46,752,000  43,678,000     
      cash dividends per common share
    85 85 80 80 80 80 75 75 75 76 70 70 70 70 65 65 65 65 60 60 60 2,060 55 55 55 55 50 50 50 50 45 45 45 -75 85 85 75 80 75 75 70 70 70 70          1,220 110 110 100 100 90 90 80 80 60 60 50 50 50 50 150 150 150 85 85 85 85 85 85 85 85 80 80 80 80 80 80 60 60 60      
      gross margin
         116,983,750 159,399,000 166,599,000 141,937,000 135,044,000 142,774,000 179,683,000 143,740,000 169,564,000 152,239,000 196,485,000 203,617,000 174,983,000 199,136,000 200,726,000 184,982,000 168,455,000 191,332,000 118,777,000 126,035,000 124,898,000 135,693,000 148,080,000 127,200,000 140,461,000 173,361,000 157,095,000 129,369,000 139,723,000 197,379,000 135,433,000 106,717,000 102,662,000 115,203,000 112,061,000 75,237,000 74,368,000 81,268,000 113,321,000                                                  
      loss
             -2,750,000 -2,750,000 -2,500,000                                                                                  
      loss from fire
                 485,000 2,891,000 17,403,000                                                                              
      restructuring charges
                         875,000 251,000 14,798,000                                       -13,000 39,000 49,000 268,000 223,000 3,738,000                          
      intangible asset impairment charges
                           19,571,000                                                                      
      income from continuing operations before income tax expense
                                     54,004,000 112,150,000 61,323,000  43,191,000 56,342,000 51,674,000 17,588,000 21,749,000 29,263,000 52,641,000                      469,000 1,142,000 -7,829,000 -4,158,000 1,906,000 10,144,000 11,865,000                      
      income tax expense on continuing operations
                                     80,901,000 9,802,000 5,251,000  4,938,000 2,667,000 8,660,000 2,703,000 2,895,000 3,441,000 9,125,000                      10,000 -3,359,000 -1,410,000 -748,000 92,000 -1,189,000 3,103,000                      
      net income from continuing operations
                                     -26,897,000 102,348,000 56,072,000  38,253,000 53,675,000 43,014,000 14,885,000                                                     
      net income from discontinued operations
                                           -255,000                                                      
      basic earnings per weighted-average common and common-equivalent share:
                                                                                                 
      diluted earnings per weighted-average common and common-equivalent share:
                                                                                                 
      income from continuing operations, net of tax
                                             22,202,500 25,822,000                                                   
      income from discontinued operations, net of tax
                                             307,000  198,000                                                  
      gain on sale of discontinued business, net of tax
                                             19,572,500 78,290,000                                                   
      discontinued operations, net of tax
                                             19,879,500 78,290,000                                                   
      income from continuing operations
                                             255 300 43,516,000                      459,000 4,501,000 -6,419,000 -3,410,000 1,814,000 11,333,000 8,762,000                      
      income from discontinued operations
                                             230 910                                                   
      other expense
                                               -55,000 -310,000   -75,000  -134,000 -166,000 -257,000  -140,000 -131,000 -99,000  -127,250 -156,000 -148,000 -205,000                                 
      product
                                                105,775,000 105,924,000 158,631,000 102,942,000 83,569,000 88,952,000 83,464,000 79,698,000 74,672,000 73,295,000 72,437,000 78,449,000 71,407,000 76,702,000 74,165,000 77,566,000 68,877,000 72,495,000 69,288,000 67,067,000 54,613,000 46,194,000 37,429,000 36,628,000 38,128,000 47,544,000 58,300,000 62,456,000 54,947,000 58,880,000 49,196,000 48,725,000 44,913,000 51,688,000 52,249,000 57,352,000 53,649,000 52,634,000 48,877,000 37,177,000 48,319,000 47,960,000 42,560,000 33,965,000 31,391,000 28,248,000 27,268,000 17,256,000  
      service
                                                7,659,000 11,259,000 10,725,000 5,860,000 7,360,000 6,744,000 7,324,000 6,812,000 6,220,000 8,873,000 7,639,000 5,877,000 6,302,000 7,340,000 5,920,000 5,827,000 5,517,000 12,425,000 5,705,000 4,744,000 4,354,000 5,100,000 3,749,000 4,340,000 4,159,000 4,278,000 4,956,000 4,633,000 5,570,000 6,441,000 5,549,000 6,017,000 6,016,000 6,617,000 5,756,000 5,722,000 5,391,000 5,622,000 5,726,000 6,021,000 7,093,000 6,507,000 5,609,000 4,739,000 5,231,000 4,640,000 4,559,000 4,524,000  
      earnings per weighted-average common and common-equivalent share:
                                                                                                 
      basic
                                                240 272.5 580 300 210 152.5 240 390 360 302.5 420 460 340 305 430 460 330 262.5 460 380 220                             
      diluted
                                                230 265 570 290 210 147.5 230 380 350 297.5 410 450 330 297.5 420 450 320 262.5 450 380 220                             
      earnings per weighted-average common and common-equivalent share :
                                                                                                 
      basic
                                                240 272.5 580 300 210 152.5 240 390 360 302.5 420 460 340 305 430 460 330 262.5 460 380 220                             
      diluted
                                                230 265 570 290 210 147.5 230 380 350 297.5 410 450 330 297.5 420 450 320 262.5 450 380 220                             
      weighted-average common and common-equivalent shares outstanding :
                                                                                                 
      basic
    166,514,000 168,049,000 167,840,000 167,886,000 169,265,000 171,438,000 171,519,000 171,568,000 171,692,000 172,249,000 172,169,000 172,429,000 172,624,000 173,407,000 173,256,000 173,507,000 174,146,000 176,463,000 176,812,000 176,626,000 176,288,000 173,489,000 173,943,000 172,283,000 172,408,000 171,194,000 170,744,000 171,318,000 171,098,000 172,333,000 172,189,000 172,370,000 173,280,000 173,287,000 86,617,000 86,639,000 86,323,000 85,338,000 85,460,000 85,107,000 84,943,000 86,296,000 86,303,000 87,199,000 86,764,000 86,858,000 86,963,000 86,782,000 86,879,000 86,946,000 87,339,000 43,522,000 43,261,000 42,833,000 42,912,000 42,851,000 42,570,000 41,859,000 42,128,000 41,842,000 41,336,000 39,924,000 39,729,000 39,683,000 39,667,000 39,659,000 39,662,000 39,656,000 39,655,000 41,437,000 41,347,000 41,942,000 42,978,000 43,725,000 43,286,000 43,857,000 44,434,000  44,825,000 46,331,000 46,922,000 46,931,000 46,286,000 46,235,000 44,928,000 44,881,000 44,512,000  42,749,000     
      diluted
    168,386,000 169,367,000 169,323,000 168,563,000 170,391,000 172,611,000 172,753,000 172,733,000 172,594,000 173,399,000 173,354,000 173,622,000 173,903,000 174,869,000 174,327,000 174,993,000 176,668,000 179,916,000 180,342,000 179,991,000 179,971,000 176,592,000 177,138,000 172,283,000 175,602,000 175,269,000 174,449,000 175,448,000 175,607,000 177,406,000 177,245,000 177,149,000 179,641,000 179,551,000 89,677,000 89,614,000 89,177,000 87,072,000 87,346,000 86,806,000 86,541,000 87,991,000 87,776,000 89,185,000 88,749,000 89,071,000 89,167,000 88,965,000 89,259,000 88,901,000 89,359,000 44,357,000 44,130,000 43,640,000 43,629,000 43,601,000 43,590,000 42,762,000 42,976,000 42,810,000 42,286,000 40,297,000 39,917,000 39,793,000 39,683,000 39,659,000 39,666,000 39,656,000 39,655,000 41,554,000 41,462,000 42,588,000 43,116,000 44,063,000 43,506,000 44,281,000 44,905,000  45,682,000 47,517,000 48,419,000 48,469,000 47,141,000 47,181,000 46,415,000 47,241,000 46,752,000  43,678,000     
      foreign currency loss
                                                     -343,000 -442,000   197,000 -409,000  -638,000    -59,000    -165,000           -323,000 -118,000 -176,750 -282,000 -280,000              
      loss from operations of discontinued business, net of tax
                                                                           -3,109,000                      
      loss from discontinued operations
                                                                         -10  -80                      
      restructuring charge
                                                                        297,000                         
      net income per common and common-equivalent share:
                                                                                                 
      basic
    310 190 110 240 140 170 170 210 70 70 110 330 150 320 200 340 390 310 450 440 400 400 500 -10 120 470 240 280 190 252.5 470 330 210    530                                    200 260 170 90 100 210 230 250 190 230 170 110 260 240 190  80     
      diluted
    310 200 100 240 140 170 170 210 70 60 110 330 150 320 190 340 380 300 440 430 390 390 490 -10 120 450 240 280 190 245 450 320 210    510                                    200 250 170 90 100 210 220 240 180 220 170 110 250 230 180  80     
      amounts include stock-based compensation expense, as follows:
                                                                                                 
      product cost of revenue
                                                                            170,000 174,000 138,000 149,000 163,000   197,000              
      service cost of revenue
                                                                            188,000 174,000 140,000 148,000 129,000   229,000              
      research, development, and engineering
                                                                            865,000 971,000 723,000 723,000 822,000   948,000              
      selling, general, and administrative
                                                                            650,000 2,151,000 1,723,000 1,509,000 1,878,000   2,131,000              
      total stock-based compensation expense
                                                                            1,873,000 3,470,000 2,724,000 2,529,000 2,992,000   3,505,000              
      investment and other income
                                                                             2,110,000 1,881,000 1,938,000 1,778,000 1,581,000 1,518,000 1,772,000 1,566,000 1,156,000 973,000 1,470,000 1,043,000 1,031,000 1,274,000 1,145,000 1,615,000 1,294,000    
      income before provision for income taxes
                                                                                 11,748,000 12,383,000 14,114,000 12,055,000 14,672,000 10,541,000 7,154,000 16,416,000 15,320,000 12,067,000 7,480,000 4,862,000 2,612,000 1,232,000 -3,601,000  
      income tax provision
                                                                                 2,243,000 2,267,000 2,680,000 3,255,000 3,814,000 2,741,000 1,860,000 4,761,000 4,442,000 3,500,000 2,342,000 1,556,000 819,000 451,000 -1,081,000  
      net income per common and common-equivalent share:
                                                                                                 
      weighted-average common and common-equivalent shares outstanding:
                                                                                                 
      amortization of goodwill
                                                                                                 
      weighted-average common and common-equivalent shares
                                                                                                 
      outstanding:
                                                                                                 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-04-05 2025-12-31 2025-09-28 2025-06-29 2025-03-30 2024-12-31 2024-09-29 2024-06-30 2024-03-31 2023-12-31 2023-10-01 2023-07-02 2023-04-02 2022-12-31 2022-10-02 2022-07-03 2022-04-03 2021-12-31 2021-10-03 2021-07-04 2021-04-04 2020-12-31 2020-09-27 2020-06-28 2020-03-29 2019-12-31 2019-09-29 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-07-01 2018-04-01 2017-12-31 2017-10-01 2017-07-02 2017-04-02 2016-12-31 2016-10-02 2016-07-03 2016-04-03 2015-12-31 2015-10-04 2015-07-05 2015-04-05 2014-12-31 2014-09-28 2014-06-29 2014-03-30 2013-12-31 2013-09-29 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-07-01 2012-04-01 2011-12-31 2011-10-02 2011-07-03 2011-04-03 2010-12-31 2010-10-03 2010-07-04 2010-04-04 2009-12-31 2009-10-04 2009-07-05 2009-04-05 2008-12-31 2008-09-28 2008-06-29 2008-03-30 2007-12-31 2007-09-30 2007-07-01 2007-04-01 2006-12-31 2006-10-01 2006-07-02 2006-04-02 2005-10-02 2005-07-03 2005-04-03 2004-10-03 2004-07-04 2004-04-04 2003-09-28 2003-06-29 2003-03-30 2002-09-29 2002-06-30 2002-03-31 2001-12-31 
                                                                                                    
        assets
                                                                                                    
        current assets:
                                                                                                    
        cash and cash equivalents
      237,343,000 262,925,000 245,898,000 179,311,000 143,744,000 186,094,000 197,075,000 176,626,000 138,859,000 202,655,000 395,501,000 177,485,000 164,171,000 181,374,000 266,004,000 177,046,000 165,769,000 186,161,000 203,479,000 217,037,000 242,688,000 269,073,000 298,356,000 286,021,000 239,197,000 171,431,000 121,701,000 89,104,000 105,296,000 108,212,000 107,371,000 129,202,000 109,572,000 106,582,000 111,349,000 68,266,000 92,428,000 79,641,000 61,145,000 54,929,000 79,914,000 51,975,000 79,563,000 61,691,000 36,047,000 55,694,000 38,179,000 40,172,000 42,463,000 40,644,000 30,446,000 47,874,000 42,757,000 45,160,000 54,158,000 205,992,000 41,559,000 38,103,000 30,175,000 42,676,000 37,014,000 33,203,000 38,213,000 37,942,000 114,664,000 119,831,000 127,162,000 125,454,000 123,020,000 127,138,000 125,094,000 131,363,000 139,464,000 104,144,000 107,343,000 78,765,000 91,666,000 87,361,000 89,550,000 79,050,000 81,880,000 92,025,000 64,759,000 55,062,000 65,105,000 70,753,000 105,982,000 58,991,000 51,442,000 50,969,000 47,108,000  31,119,000 31,660,000 
        current investments
      59,413,000                         240,470,000 292,072,000 364,487,000 441,337,000                                                                  
        accounts receivable
      170,721,000                                                                                              
        unbilled revenue
      16,401,000 16,980,000 16,909,000 2,176,000 2,755,000 3,055,000 2,117,000 1,858,000 2,737,000 2,402,000 1,588,000 2,243,000 2,354,000 2,179,000 2,142,000 2,268,000 1,847,000 3,990,000 7,325,000 1,788,000 1,663,000 5,632,000 15,389,000 978,000 5,485,000 4,782,000 11,210,000 10,300,000 10,202,000 8,312,000 13,948,000 3,603,000 4,232,000 7,454,000 51,612,000 5,939,000 1,289,000 2,217,000 10,090,000 25,500,000    51,648,000   13,292,000                                                
        inventories
      135,549,000 137,889,000 143,679,000 144,577,000 152,113,000 157,527,000 155,278,000 157,255,000 170,871,000 162,285,000 133,866,000 126,226,000 127,147,000 122,480,000 108,553,000 96,012,000 136,660,000 113,102,000 81,170,000 68,503,000 61,392,000 60,830,000 53,860,000 52,953,000 54,985,000 60,261,000 65,264,000 72,889,000 79,208,000 83,282,000 94,035,000 89,556,000 96,399,000 67,923,000 48,061,000 36,491,000 32,615,000 26,984,000 27,226,000 25,882,000 35,620,000 37,334,000 39,841,000 39,400,000 48,458,000 35,536,000 31,210,000 30,737,000 28,434,000 25,694,000 27,625,000 26,653,000 26,057,000 26,182,000 24,995,000 25,113,000 27,807,000 28,098,000 28,595,000 27,004,000 27,262,000 22,717,000 23,867,000 20,100,000 17,877,000 16,832,000 20,925,000 22,378,000 24,395,000 25,063,000 26,563,000 28,815,000 28,128,000 27,459,000 30,048,000 32,658,000 32,724,000 30,583,000 28,195,000 26,039,000 22,021,000 18,579,000 18,057,000 17,799,000 16,715,000 14,817,000 14,221,000 15,152,000 16,598,000 17,517,000 19,146,000  21,995,000 23,078,000 
        prepaid expenses and other current assets
      70,922,000 58,702,000 55,453,000 66,823,000 61,179,000 63,376,000 68,841,000 73,524,000 71,173,000 68,099,000 68,347,000 73,090,000 67,634,000 67,490,000 106,046,000 105,384,000 64,573,000 68,742,000 61,196,000 65,646,000 47,773,000 37,220,000 37,411,000 51,768,000 35,913,000 26,840,000 28,127,000 34,451,000 30,778,000 34,000,000 27,687,000 47,362,000 26,068,000 30,800,000 38,824,000 50,157,000 33,349,000 20,870,000 21,921,000 23,601,000 12,512,000 15,871,000 14,469,000 20,997,000 17,857,000 22,997,000 17,032,000 15,184,000 17,797,000 20,265,000 19,300,000 15,777,000 13,769,000 14,394,000 17,657,000 23,698,000 22,033,000 19,628,000 20,835,000 21,810,000 20,569,000 23,059,000 26,640,000 23,828,000 18,399,000 18,471,000 13,013,000 13,379,000 15,220,000 18,923,000 17,293,000 16,384,000 15,147,000 16,470,000 16,069,000 15,407,000 16,278,000 18,127,000 13,969,000 12,973,000 12,222,000 15,627,000 16,338,000 11,695,000 12,509,000 14,744,000 17,758,000 11,631,000 11,319,000 7,970,000 11,243,000  9,600,000 10,082,000 
        total current assets
      690,349,000 697,246,000 670,919,000 625,725,000 577,679,000 613,367,000 672,082,000 681,017,000 661,530,000 678,997,000 846,991,000 718,382,000 722,163,000 717,699,000 787,467,000 734,758,000 672,880,000 639,798,000 672,067,000 692,878,000 625,571,000 601,691,000 628,136,000 646,475,000 595,287,000 607,231,000 625,781,000 678,874,000 773,245,000 780,326,000 798,498,000 759,547,000 670,549,000 630,108,000 645,083,000 581,848,000 593,944,000 526,344,000 530,828,000 485,724,000 492,930,000 451,598,000 486,135,000 490,103,000 309,959,000 264,606,000 257,749,000 268,256,000 189,881,000 332,051,000 319,067,000 277,179,000 257,099,000 239,597,000 250,226,000 369,875,000 302,910,000 285,346,000 274,339,000 342,301,000 303,623,000 279,005,000 257,389,000 228,165,000 247,720,000 249,354,000 254,126,000 251,770,000 248,280,000 264,424,000 284,666,000 304,239,000 307,542,000 307,679,000 289,417,000 252,814,000 302,790,000 313,081,000 299,891,000 305,223,000 335,231,000 313,403,000 277,666,000 340,720,000 321,241,000 308,385,000 253,648,000        
        non-current investments
      325,186,000                         433,452,000 504,641,000 408,032,000 317,054,000                                                                  
        property, plant, and equipment
      84,291,000 86,015,000 89,868,000 93,428,000 95,979,000 98,445,000 103,177,000 102,997,000 104,111,000 105,849,000 82,965,000 81,638,000 81,274,000 79,714,000 79,425,000 79,468,000 77,870,000 77,546,000 76,882,000 76,972,000 77,081,000 79,173,000 81,225,000 83,936,000 86,702,000 89,443,000 88,429,000 89,342,000 91,273,000 91,396,000 88,930,000 87,893,000 85,205,000 78,048,000 65,957,000 61,196,000 57,255,000 53,992,000 55,730,000 53,406,000 53,413,000 53,285,000 51,105,000 49,905,000 48,692,000 47,907,000 39,318,000 38,321,000 37,826,000 37,136,000 35,565,000 35,343,000 34,647,000 34,820,000 34,344,000 33,663,000 32,720,000 31,744,000 30,869,000 30,590,000 30,063,000 29,596,000 28,316,000 27,981,000 28,290,000 28,576,000 28,959,000 28,197,000 28,011,000 27,764,000 27,334,000 28,024,000 27,525,000 26,680,000 26,327,000 26,525,000 26,509,000 26,028,000 24,335,000 24,220,000 24,240,000 24,100,000 24,216,000 23,573,000 23,835,000 24,117,000 24,500,000 25,083,000 25,862,000 26,556,000 28,279,000 29,617,000 30,220,000 31,213,000 
        operating lease assets
      69,709,000 72,310,000 74,182,000 77,990,000 70,212,000 67,326,000 72,433,000 71,283,000 74,113,000 75,115,000 66,760,000 68,594,000 37,769,000 37,682,000 31,514,000 32,128,000 32,217,000 23,157,000 24,154,000 21,277,000 20,784,000 22,582,000 24,942,000 25,819,000 17,346,000 17,522,000 15,806,000 17,928,000 17,354,000                                                                  
        goodwill
      382,818,000 386,279,000 392,084,000 397,389,000 389,929,000 384,937,000 391,673,000 381,042,000 386,157,000 393,181,000 241,042,000 241,582,000 242,041,000 242,630,000 237,509,000 239,798,000 241,180,000 241,713,000 241,799,000 242,906,000 243,036,000 244,078,000 243,129,000 242,436,000 242,214,000 243,445,000 113,208,000 113,208,000 113,208,000 113,208,000 113,208,000 113,208,000 113,208,000 113,208,000 113,208,000 115,089,000 95,280,000 95,280,000 82,831,000 81,448,000 81,448,000 81,448,000 81,448,000 77,388,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,689,000 81,820,000 82,181,000 82,029,000 82,277,000 82,654,000 82,524,000 82,204,000 82,313,000 81,720,000 82,262,000 82,604,000 82,739,000 80,839,000 80,453,000 80,765,000 81,041,000 81,488,000 87,358,000 86,461,000 84,621,000 83,975,000 83,391,000 83,318,000 82,976,000 83,060,000 79,922,000 80,733,000 80,704,000 6,764,000 6,562,000 6,462,000 6,447,000 5,376,000 5,360,000 3,802,000 3,593,000 3,616,000 3,359,000  
        intangible assets
      67,140,000 81,100,000 86,751,000 92,135,000 91,134,000 90,684,000 102,550,000 98,548,000 105,054,000 112,952,000 9,986,000 10,729,000 11,472,000 12,414,000 9,420,000 10,226,000 11,048,000 11,888,000 12,782,000 13,702,000 14,628,000 15,555,000 16,482,000 17,337,000 38,102,000 39,490,000 7,994,000 8,575,000 9,344,000 10,113,000 10,882,000 11,651,000 12,420,000 13,189,000 14,427,000 15,226,000 7,440,000 8,312,000 4,716,000 4,453,000 5,270,000 6,315,000 7,361,000 7,653,000 9,606,000 10,699,000 11,789,000 12,892,000 13,807,000 14,723,000 11,890,000 12,849,000 13,809,000 14,770,000 15,783,000 16,820,000 17,873,000 18,910,000 19,969,000 21,047,000 22,084,000 23,130,000 24,480,000 25,721,000 27,037,000 28,337,000 29,604,000 27,711,000 28,779,000 31,278,000 33,752,000 36,888,000 38,593,000 39,724,000 41,023,000 42,249,000 43,617,000 44,988,000 46,300,000 47,822,000 48,704,000 51,537,000 52,922,000 6,800,000 7,341,000 7,598,000 7,960,000 5,517,000 5,780,000 817,000 1,047,000 1,244,000 1,382,000  
        deferred income taxes
      381,100,000 383,272,000 383,611,000 387,232,000 390,170,000 392,166,000 395,205,000 396,723,000 397,563,000 400,400,000 403,013,000 407,257,000 409,583,000 407,241,000 405,136,000 411,505,000 412,333,000 418,570,000 420,962,000 425,618,000 429,801,000 434,704,000 439,574,000 443,732,000 450,280,000 449,519,000 29,273,000 28,537,000 28,596,000 28,660,000 27,376,000 29,892,000 29,135,000 27,385,000 30,524,000 29,681,000 27,096,000 28,022,000 27,529,000 29,083,000 28,201,000 7,104,000 8,666,000 9,248,000 8,990,000 8,985,000 8,329,000 7,829,000 7,463,000 7,611,000 6,292,000 6,371,000 6,325,000 6,369,000 6,785,000 6,744,000 6,707,000 6,880,000 6,498,000 6,319,000 6,312,000 6,302,000 7,951,000 7,748,000 7,728,000 7,693,000 12,253,000 12,266,000 11,256,000 10,231,000 7,424,000 7,330,000 7,325,000 7,504,000 8,446,000 8,607,000 8,617,000 8,636,000 7,646,000 7,741,000 7,746,000 8,150,000 8,552,000 9,617,000 7,653,000 6,815,000 8,479,000 9,623,000 9,875,000 9,966,000 12,076,000 13,468,000 12,174,000 12,175,000 
        other assets
      5,025,000 4,994,000 5,257,000 5,294,000 5,090,000 5,027,000 6,840,000 6,260,000 6,279,000 7,088,000 6,151,000 6,438,000 6,725,000 6,643,000 6,567,000 6,799,000 7,158,000 7,242,000 7,363,000 7,603,000 7,692,000 7,794,000 7,684,000 8,042,000 8,191,000 5,833,000 5,320,000 5,424,000 3,698,000 3,925,000 3,873,000 2,178,000 2,217,000 2,491,000 2,817,000 3,300,000 2,379,000 2,319,000 2,526,000 2,623,000 2,615,000 2,609,000 2,778,000 2,756,000 1,617,000 1,536,000 1,728,000 2,038,000 2,110,000 2,138,000 2,316,000 2,388,000 2,532,000 2,827,000 2,785,000 2,771,000 2,700,000 3,027,000 1,718,000 1,658,000 1,567,000 1,559,000 1,501,000 10,129,000 9,608,000 9,722,000 10,080,000 10,108,000 9,932,000 10,754,000 9,533,000 9,047,000 9,733,000 8,687,000 8,384,000 7,922,000 7,899,000 1,694,000 3,399,000 3,443,000 3,394,000 4,676,000 4,731,000 3,632,000 3,754,000 3,794,000 3,867,000 3,775,000 3,668,000 3,414,000 3,623,000 3,666,000 3,514,000 8,576,000 
        total assets
      2,005,618,000 2,016,555,000 2,002,750,000 2,003,541,000 1,932,503,000 1,992,850,000 2,063,247,000 2,004,084,000 2,013,233,000 2,017,812,000 1,989,899,000 1,998,114,000 1,974,066,000 1,958,140,000 1,900,236,000 1,943,083,000 1,934,115,000 2,003,662,000 2,048,803,000 2,024,921,000 1,908,956,000 1,800,702,000 2,060,515,000 1,934,864,000 1,885,077,000 1,885,935,000 1,390,452,000 1,349,920,000 1,353,772,000 1,289,667,000 1,324,696,000 1,276,310,000 1,268,915,000 1,287,870,000 1,258,517,000 1,160,998,000 1,096,244,000 1,038,604,000 1,020,087,000 964,440,000 913,637,000 887,756,000 887,400,000                                                    
        liabilities and shareholders’ equity
                                                                                                    
        current liabilities:
                                                                                                    
        accounts payable
      59,551,000 50,203,000 45,480,000 42,273,000 43,303,000 38,046,000 29,984,000 22,617,000 27,459,000 21,454,000 23,053,000 26,109,000 26,939,000 27,103,000 22,220,000 20,364,000 44,733,000 44,051,000 26,797,000 32,304,000 20,970,000 16,270,000 21,464,000 17,999,000 16,195,000 17,866,000 12,766,000 11,729,000 20,529,000 16,230,000 22,295,000 12,588,000 29,136,000 23,463,000 30,331,000 22,815,000 17,115,000 9,830,000 10,106,000 14,157,000 10,296,000 7,860,000 10,026,000 15,202,000 13,295,000 19,114,000 13,302,000 15,329,000 9,671,000 9,487,000 7,457,000 7,157,000 6,815,000 6,815,000 7,567,000 6,535,000 7,341,000 7,098,000 7,388,000 6,922,000 8,078,000 7,153,000 6,336,000 7,026,000 6,812,000 4,959,000 4,851,000 3,260,000 4,915,000 6,780,000 5,348,000 9,576,000 6,501,000 7,245,000 4,551,000 4,735,000 5,640,000 6,463,000 5,989,000 7,276,000 6,249,000 4,629,000 4,975,000 3,855,000 4,906,000 5,070,000 5,538,000 4,142,000 3,393,000 2,866,000 6,517,000  2,984,000 4,356,000 
        accrued expenses
      77,399,000 91,397,000 86,708,000 78,344,000 67,849,000 71,760,000 76,675,000 75,405,000 70,429,000 72,374,000 79,121,000 83,605,000 83,527,000 93,235,000 64,115,000 70,051,000 63,122,000 92,432,000 80,337,000 76,653,000 60,422,000 77,264,000 68,348,000 66,264,000 63,955,000 52,199,000 48,561,000 48,709,000 48,948,000 60,220,000 66,632,000 58,654,000 56,463,000 68,249,000 53,070,000 42,621,000 38,904,000 42,539,000 42,593,000 36,061,000 30,653,000 33,272,000 32,871,000 31,276,000 32,240,000 39,949,000 39,503,000 32,921,000 26,140,000 34,331,000 31,367,000 28,279,000 24,258,000 29,590,000 28,918,000 28,020,000 23,431,000 32,290,000 30,296,000 27,941,000 23,938,000 29,346,000 26,492,000 24,307,000 18,002,000 18,811,000 16,079,000 18,578,000 17,150,000 21,855,000 22,979,000 21,233,000 22,779,000 20,098,000 34,548,000 30,417,000 30,544,000 40,612,000 49,477,000 48,798,000 44,438,000 46,109,000 44,403,000 44,544,000 45,240,000 35,113,000 32,750,000 26,640,000 24,840,000 21,163,000 14,333,000  16,154,000 16,387,000 
        accrued income taxes
      6,172,000 9,141,000 2,705,000 5,483,000 22,677,000 25,685,000 24,226,000 20,827,000 40,433,000 16,907,000 19,302,000 19,121,000 37,529,000 18,129,000 12,055,000 18,285,000 24,465,000 8,577,000 12,271,000 11,644,000 18,823,000 9,379,000 8,006,000 5,952,000 38,692,000 30,333,000 4,012,000 1,078,000 1,560,000 5,062,000 8,974,000 12,477,000 11,915,000 11,391,000 10,053,000 4,957,000 5,696,000 5,193,000 470,000 3,238,000 1,494,000 985,000 9,112,000 397,000 928,000 1,048,000 1,450,000 569,000 276,000 1,263,000 90,000 208,000 2,220,000 1,009,000 3,583,000 3,779,000 1,012,000 1,259,000 2,006,000 8,726,000 10,107,000 7,771,000 10,299,000 7,732,000 2,626,000 2,000 462,000 1,717,000 1,861,000 2,986,000 5,188,000 2,831,000 3,180,000 3,242,000 5,030,000 3,095,000 1,943,000              2,003,000  486,000 2,099,000 
        deferred revenue and customer deposits
      34,053,000 21,094,000 23,767,000 53,077,000 39,858,000 25,035,000 30,045,000 40,529,000 39,983,000 31,525,000 40,246,000 43,439,000 57,805,000 40,787,000 54,777,000 75,385,000 54,455,000 35,743,000 37,843,000 76,445,000 51,660,000 21,274,000 33,717,000 46,738,000 26,252,000 14,432,000 10,431,000 18,332,000 16,625,000 9,845,000 13,252,000 40,881,000 15,504,000 9,969,000 16,072,000 18,011,000 13,801,000 8,211,000 15,905,000 15,733,000 11,862,000 11,571,000 15,311,000   20,563,000   16,443,000 15,941,000 11,722,000 13,479,000 13,819,000 12,690,000 11,755,000 11,753,000 12,473,000 13,458,000 13,165,000 13,089,000 11,573,000 10,162,000 16,234,000 15,609,000 14,757,000 14,908,000 10,858,000 12,132,000 15,392,000 19,429,000 17,931,000 15,188,000 14,549,000 13,288,000 15,184,000                    
        operating lease liabilities
      12,310,000 11,716,000 10,613,000 11,260,000 10,277,000 8,854,000 9,806,000 9,405,000 9,798,000 9,624,000 7,982,000 8,188,000 8,177,000 8,454,000 8,111,000 8,156,000 8,351,000 7,786,000 7,889,000 7,888,000 7,805,000 8,110,000 7,863,000 7,628,000 5,550,000 5,647,000 5,445,000 5,835,000 5,383,000                                                                  
        total current liabilities
      189,485,000 183,551,000 169,273,000 190,437,000 183,964,000 169,380,000 170,736,000 168,783,000 188,102,000 151,884,000 169,704,000 180,462,000 213,977,000 187,708,000 161,278,000 192,241,000 195,126,000 188,589,000 165,137,000 204,934,000 159,680,000 132,297,000 139,398,000 144,581,000 150,644,000 120,477,000 81,215,000 85,683,000 93,045,000 91,357,000 111,153,000 124,600,000 113,018,000 113,072,000 109,526,000 88,404,000 75,516,000 65,773,000 69,074,000 69,189,000 54,305,000 54,007,000 67,822,000 80,467,000 66,910,000 80,674,000 78,508,000 74,146,000 52,530,000 61,022,000 50,636,000 49,123,000 47,112,000 50,104,000 51,823,000 50,087,000 44,257,000 54,105,000 52,855,000 56,678,000 53,696,000 54,432,000 59,361,000 54,674,000 42,197,000 38,680,000 32,250,000 35,687,000 39,318,000 51,050,000 51,446,000 48,828,000 47,009,000 43,873,000 59,313,000 50,239,000 48,289,000 54,801,000 63,299,000 64,455,000 59,434,000 59,134,000 58,967,000 58,285,000 60,035,000 48,911,000 46,957,000        
        non-current operating lease liabilities
      61,707,000 64,870,000 68,312,000 71,925,000 63,425,000 61,363,000 67,375,000 64,778,000 67,367,000 68,977,000 60,450,000 61,852,000 31,389,000 31,298,000 25,260,000 26,096,000 26,179,000 17,795,000 18,922,000 16,362,000 16,223,000 18,120,000 20,053,000 21,208,000 12,416,000 12,326,000 10,722,000 12,149,000 11,953,000                                                                  
        reserve for income taxes
      21,336,000 24,269,000 26,359,000 25,742,000 27,194,000 26,365,000 26,491,000 28,826,000 28,144,000 26,685,000 19,450,000 19,239,000 20,030,000 15,866,000 12,204,000 12,876,000 15,110,000 14,780,000 14,805,000 15,227,000 14,752,000 14,257,000 11,325,000 12,302,000 11,891,000 11,563,000 7,151,000 8,091,000 7,748,000 7,106,000 6,646,000 7,399,000 6,958,000 6,488,000 5,563,000 6,122,000 5,641,000 5,361,000 5,104,000 5,651,000 5,233,000 4,830,000 3,933,000 4,603,000 4,372,000 4,623,000 3,942,000 3,803,000 3,939,000 4,765,000 4,390,000 6,255,000 5,955,000 5,216,000 4,890,000 5,066,000 4,931,000 4,796,000 4,291,000 5,694,000 5,528,000 5,361,000 4,954,000 4,908,000 6,840,000 6,741,000 6,327,000 10,219,000 10,063,000 9,922,000 9,656,000 19,470,000 19,512,000 19,308,000 17,913,000 13,098,000 12,743,000                  
        other liabilities
      1,891,000 1,452,000 88,000 91,000 87,000 1,082,000 1,251,000 1,169,000 893,000 299,000  403,000 444,000 1,905,000 19,316,000 17,285,000 15,216,000 15,476,000 13,996,000 11,626,000 9,453,000 9,959,000 8,292,000 5,085,000 3,186,000 2,402,000 744,000 1,244,000 1,054,000                                                        248,000 243,000 243,000        
        total liabilities
      526,649,000 524,654,000 513,114,000 497,484,000 486,875,000 475,345,000 496,221,000 497,354,000 524,044,000 513,060,000 501,301,000 517,651,000 527,735,000 519,746,000 511,016,000 553,098,000 575,370,000 573,569,000 555,842,000 595,467,000 551,955,000 538,500,000 554,686,000 558,386,000 557,584,000 530,225,000 151,234,000 158,280,000 164,913,000 154,404,000 175,252,000 197,178,000 191,816,000 192,517,000 124,994,000 109,022,000 85,032,000 76,005,000 76,139,000 77,796,000 62,918,000 62,089,000 74,607,000                                                    
        commitments and contingencies
                                                                                                    
        shareholders’ equity:
                                                                                                    
        preferred stock, .01 par value – authorized: 400 shares in 2026 and 2025, respectively; no shares issued and outstanding
                                                                                                    
        common stock
      333,000 334,000 335,000 336,000 336,000 341,000 343,000 343,000 343,000 343,000 344,000 345,000 345,000 345,000 346,000 347,000 347,000 351,000 354,000 353,000 353,000 352,000 349,000 346,000 344,000 345,000 342,000 341,000 343,000 342,000 345,000 344,000 346,000 347,000 173,000 173,000 173,000 172,000 171,000 170,000 170,000 170,000 170,000 174,000 174,000 173,000 174,000 174,000 174,000 174,000 175,000 87,000  86,000 86,000 86,000 86,000  84,000 84,000 83,000  80,000 79,000 79,000   79,000   82,000 84,000  87,000 87,000    89,000 91,000 93,000  93,000  92,000          
        additional paid-in capital
      1,194,927,000 1,138,708,000 1,123,134,000 1,110,458,000 1,097,989,000 1,090,638,000 1,076,363,000 1,061,597,000 1,047,643,000 1,037,202,000 1,023,960,000 1,010,973,000 992,690,000 979,167,000 960,446,000 947,269,000 933,452,000 914,802,000 900,190,000 874,883,000 854,491,000 807,739,000 762,832,000 710,412,000 664,132,000 639,372,000 594,427,000 578,871,000 555,834,000 529,208,000 518,556,000 498,343,000 485,654,000 461,338,000 443,132,000 425,406,000 411,650,000 375,030,000 349,981,000 330,969,000 321,252,000 311,008,000 306,344,000 294,155,000 272,070,000 251,717,000 245,687,000 231,907,000 223,560,000 211,440,000 206,152,000 190,444,000 179,192,000 165,248,000 161,296,000 157,867,000 154,922,000 135,668,000 129,845,000 130,171,000 115,368,000 102,620,000 78,347,000 69,984,000 69,321,000 69,271,000 77,981,000 76,745,000 75,048,000 73,280,000 93,905,000 115,188,000 113,494,000 140,943,000 137,377,000 132,818,000 156,684,000  155,075,000 168,972,000 200,195,000 218,342,000 197,581,000 195,734,000 188,517,000 186,267,000 234,353,000 205,136,000 189,995,000 186,051,000 183,365,000  178,530,000 173,675,000 
        retained earnings
      344,443,000 406,355,000 412,347,000 433,040,000 405,949,000 499,303,000 527,909,000 515,142,000 502,338,000 512,543,000 534,337,000 537,947,000 517,526,000 528,179,000 510,877,000 512,230,000 488,511,000 562,882,000 634,165,000 593,290,000 540,686,000 487,912,000 780,521,000 702,597,000 713,208,000 753,268,000 682,383,000 649,234,000 670,754,000 646,214,000 670,935,000 619,212,000 622,856,000 668,267,000 727,319,000 669,347,000 652,917,000 643,825,000 640,230,000 603,204,000 575,548,000 566,613,000 553,792,000 546,205,000 544,448,000 523,946,000 521,845,000 479,581,000 466,350,000 462,131,000 461,538,000 456,978,000 452,049,000 436,466,000 472,729,000 459,645,000 444,592,000 434,581,000 419,699,000 405,463,000 390,146,000 379,826,000 363,329,000 347,566,000 335,021,000 328,459,000 329,983,000 327,465,000 335,867,000 345,225,000 349,350,000 344,146,000 342,048,000 337,231,000 329,820,000 326,158,000 326,087,000 329,251,000 323,537,000 317,227,000 309,469,000 296,491,000 289,401,000 285,308,000 280,754,000 272,779,000 264,615,000 255,640,000 253,109,000 249,803,000 247,586,000  251,517,000 254,037,000 
        accumulated other comprehensive loss, net of tax
      -60,734,000 -53,496,000 -46,180,000 -37,777,000 -58,646,000 -72,777,000 -37,589,000 -70,352,000 -61,135,000 -45,336,000 -70,043,000 -68,802,000 -64,230,000 -69,297,000 -82,449,000 -69,861,000 -63,565,000 -47,942,000 -41,748,000 -39,072,000 -38,529,000 -33,801,000 -37,873,000 -36,877,000 -50,191,000 -37,275,000 -37,934,000 -36,806,000 -38,072,000 -40,501,000 -40,392,000 -38,767,000 -31,757,000 -34,599,000 -37,101,000 -42,950,000 -53,528,000 -56,428,000 -46,434,000 -47,699,000 -46,251,000 -52,124,000 -47,513,000 -47,398,000 -49,629,000 -39,399,000 -33,754,000 -29,155,000 -29,036,000 -29,833,000 -30,141,000 -32,511,000 -31,867,000 -29,515,000 -28,709,000 -26,005,000 -10,807,000 -17,353,000 -8,267,000  -171,000 -9,217,000    -3,361,000                             
        total shareholders’ equity
      1,478,969,000 1,491,901,000 1,489,636,000 1,506,057,000 1,445,628,000 1,517,505,000 1,567,026,000 1,506,730,000 1,489,189,000 1,504,752,000 1,488,598,000 1,480,463,000 1,446,331,000 1,438,394,000 1,389,220,000 1,389,985,000 1,358,745,000 1,430,093,000 1,492,961,000 1,429,454,000 1,357,001,000 1,262,202,000 1,505,829,000 1,376,478,000 1,327,493,000 1,355,710,000 1,239,218,000 1,191,640,000 1,188,859,000 1,135,263,000 1,149,444,000 1,079,132,000 1,077,099,000 1,095,353,000 1,133,523,000 1,051,976,000 1,011,212,000 962,599,000 943,948,000 886,644,000 850,719,000 825,667,000 812,793,000 793,136,000 767,063,000 736,437,000 733,952,000 682,507,000 661,048,000 643,912,000 637,724,000 614,998,000 599,461,000 572,285,000 605,402,000 591,593,000 588,793,000 552,980,000 541,361,000 540,285,000 505,426,000 473,311,000 435,423,000 394,887,000 394,156,000 394,448,000 408,320,000 398,446,000 396,314,000 413,075,000 440,427,000 466,012,000 465,642,000 476,365,000 461,705,000 448,965,000 473,045,000 473,850,000 466,184,000 473,894,000 496,064,000 501,047,000 473,143,000 466,427,000           
        total liabilities and shareholders' equity
      2,005,618,000 2,016,555,000 2,002,750,000 2,003,541,000 1,932,503,000 1,992,850,000 2,063,247,000 2,004,084,000 2,013,233,000 2,017,812,000 1,989,899,000 1,998,114,000 1,974,066,000 1,958,140,000 1,900,236,000 1,943,083,000 1,934,115,000 2,003,662,000 2,048,803,000 2,024,921,000 1,908,956,000 1,800,702,000 2,060,515,000 1,934,864,000 1,885,077,000  1,390,452,000                                                                    
        current investments, amortized cost of 74,050 and 60,725 in 2025 and 2024, respectively, allowance for credit losses of 0 in 2025 and 2024
       74,037,000                                                                                             
        accounts receivable, allowance for credit losses of 728 and 827 in 2025 and 2024, respectively
       146,713,000                                                                                             
        non-current investments, amortized cost of 302,539 and 345,033 in 2025 and 2024, respectively, allowance for credit losses of 0 in 2025 and 2024
       305,339,000                                                                                             
        preferred stock, 0.01 par value - authorized: 400 shares in 2025 and 2024, respectively, no shares issued and outstanding
                                                                                                    
        current investments, allowance for credit losses of 0 in 2025 and 2024
        54,368,000 48,892,000 56,703,000                                                                                          
        accounts receivable, allowance for credit losses of 732 and 827 in 2025 and 2024, respectively
        154,612,000                                                                                            
        non-current investments, allowance for credit losses of 0 in 2025 and 2024
        300,078,000 324,348,000                                                                                           
        preferred stock, .01 par value – authorized: 400 shares in 2025 and 2024, respectively; no shares issued and outstanding
                                                                                                    
        accounts receivable, allowance for credit losses of 620 and 827 in 2025 and 2024, respectively
         183,946,000                                                                                           
        accounts receivable, allowance for credit losses of 598 and 827 in 2025 and 2024, respectively
          161,185,000                                                                                          
        non-current investments, respectively, allowance for credit losses of 0 in 2025 and 2024
          312,310,000                                                                                          
        current investments, amortized cost of 60,725 and 132,799 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
           59,956,000                                                                                         
        accounts receivable, allowance for credit losses of 827 and 583 in 2024 and 2023, respectively
           143,359,000                                                                                         
        non-current investments, amortized cost of 345,033 and 250,790 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
           340,898,000                                                                                         
        non-current accrued income taxes
               18,338,000 18,337,000 18,338,000 18,338,000 33,008,000 33,008,000 33,008,000 44,010,000 43,160,000 40,963,000 40,963,000 40,963,000 48,915,000 48,915,000 48,915,000 48,915,000 51,113,000 51,113,000 51,113,000 51,113,000                                                                  
        preferred stock, 0.01 par value - authorized: 400 shares in 2024 and 2023, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 91,658 and 132,799 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
            90,803,000                                                                                        
        accounts receivable, allowance for credit losses of 604 and 583 in 2024 and 2023, respectively
            157,968,000                                                                                        
        non-current investments, amortized cost of 318,268 and 250,790 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
            319,287,000                                                                                        
        preferred stock, .01 par value – authorized: 400 shares in 2024 and 2023, respectively; no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 114,177 and 132,799 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
             112,449,000                                                                                       
        accounts receivable, allowance for credit losses of 665 and 583 in 2024 and 2023, respectively
             159,305,000                                                                                       
        non-current investments, amortized cost of 272,613 and 250,790 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
             266,214,000                                                                                       
        current investments, amortized cost of 141,876 and 132,799 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
              139,334,000                                                                                      
        accounts receivable, allowance for credit losses of 1,339 and 583 in 2024 and 2023, respectively
              138,556,000                                                                                      
        non-current investments, amortized cost of 285,376 and 250,790 in 2024 and 2023, respectively, allowance for credit losses of 0 in 2024 and 2023
              278,426,000                                                                                      
        current investments, amortized cost of 132,799 and 223,545 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
               129,392,000                                                                                     
        accounts receivable, allowance for credit losses of 583 and 730 in 2023 and 2022, respectively
               114,164,000                                                                                     
        non-current investments, amortized cost of 250,790 and 476,148 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
               244,230,000                                                                                     
        preferred stock, 0.01 par value - authorized: 400 shares in 2023 and 2022, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 120,831 and 223,545 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                117,147,000                                                                                    
        accounts receivable, allowance for credit losses of 580 and 730 in 2023 and 2022, respectively
                130,542,000                                                                                    
        non-current investments, amortized cost of 349,060 and 476,148 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                332,991,000                                                                                    
        preferred stock, .01 par value – authorized: 400 shares in 2023 and 2022, respectively; no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 195,690 and 223,545 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                 191,474,000                                                                                   
        accounts receivable, allowance for credit losses of 602 and 730 in 2023 and 2022, respectively
                 147,864,000                                                                                   
        non-current investments, amortized cost of 481,101 and 476,148 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                 463,494,000                                                                                   
        current investments, amortized cost of 220,943 and 223,545 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                  216,703,000                                                                                  
        accounts receivable, allowance for credit losses of 1,001 and 730 in 2023 and 2022, respectively
                  144,154,000                                                                                  
        non-current investments, amortized cost of 478,329 and 476,148 in 2023 and 2022, respectively, allowance for credit losses of 0 in 2023 and 2022
                  463,039,000                                                                                  
        current investments, amortized cost of 223,545 and 137,124 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                   218,759,000                                                                                 
        accounts receivable, allowance for credit losses of 730 and 776 in 2022 and 2021, respectively
                   125,417,000                                                                                 
        non-current investments, amortized cost of 476,148 and 587,981 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                   454,117,000                                                                                 
        preferred stock, 0.01 par value - authorized: 400 shares in 2022 and 2021, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 213,044 and 137,124 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                    208,430,000                                                                                
        accounts receivable, allowance for credit losses of 741 and 776 in 2022 and 2021, respectively
                    96,292,000 171,414,000                                                                               
        non-current investments, amortized cost of 369,868 and 587,981 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                    343,198,000                                                                                
        preferred stock, .01 par value – authorized: 400 shares in 2022 and 2021, respectively; no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 184,849 and 137,124 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                     182,634,000                                                                               
        non-current investments, amortized cost of 450,669 and 587,981 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                     428,401,000                                                                               
        current investments, amortized cost of 149,574 and 137,124 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                      148,966,000                                                                              
        accounts receivable, allowance for credit losses of 766 and 776 in 2022 and 2021, respectively
                      155,065,000                                                                              
        non-current investments, amortized cost of 500,273 and 587,981 in 2022 and 2021, respectively, allowance for credit losses of 0 in 2022 and 2021
                      479,429,000                                                                              
        current investments, amortized cost of 137,124 and 102,258 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                       137,455,000                                                                             
        accounts receivable, allowance for credit losses of 776 and 831 in 2021 and 2020, respectively
                       130,348,000                                                                             
        non-current investments, amortized cost of 587,981 and 390,417 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                       583,748,000                                                                             
        preferred stock, .01 par value - authorized: 400 shares in 2021 and 2020, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 188,349 and 102,258 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                        189,113,000                                                                            
        accounts receivable, allowance for credit losses of 792 and 831 in 2021 and 2020, respectively
                        129,784,000                                                                            
        non-current investments, amortized cost of 591,378 and 390,417 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                        592,794,000                                                                            
        preferred stock, .01 par value – authorized: 400 shares in 2021 and 2020, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 189,818 and 102,258 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                         190,747,000                                                                           
        accounts receivable, allowance for credit losses of 803 and 831 in 2021 and 2020, respectively
                         149,157,000                                                                           
        non-current investments, amortized cost of 542,015 and 390,417 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                         543,965,000                                                                           
        current investments, amortized cost of 142,469 and 102,258 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                          143,233,000                                                                          
        accounts receivable, allowance for credit losses of 798 and 831 in 2021 and 2020, respectively
                          128,822,000                                                                          
        non-current investments, amortized cost of 487,978 and 390,417 in 2021 and 2020, respectively, allowance for credit losses of 0 in 2021 and 2020
                          490,363,000                                                                          
        current investments, amortized cost of 102,258 and 235,610 in 2020 and 2019, respectively, allowance for credit losses of 0 in 2020 and 2019
                           103,240,000                                                                         
        accounts receivable, allowance for credit losses of 831 and 530 in 2020 and 2019, respectively
                           125,696,000                                                                         
        non-current investments, amortized cost of 390,417 and 431,633 in 2020 and 2019, respectively, allowance for credit losses of 0 in 2020 and 2019
                           395,125,000                                                                         
        preferred stock, .01 par value - authorized: 400 shares in 2020 and 2019, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 94,761 and 235,610 in 2020 and 2019, respectively, allowance for expected credit losses of 0 in 2020 and 2019
                            95,365,000                                                                        
        accounts receivables
                            127,755,000 111,671,000 100,463,000 103,447,000 107,407,000 107,643,000 106,424,000 119,172,000 135,441,000 136,084,000 96,649,000 119,388,000 121,976,000 78,593,000 58,236,000 55,438,000 82,068,000 61,219,000 45,095,000 42,846,000 71,012,000 44,728,000 56,264,000 50,938,000 99,949,000 69,780,000 51,947,000 53,015,000 48,832,000 45,215,000 42,780,000 42,387,000 44,761,000 48,385,000 45,595,000 48,206,000 45,827,000 42,480,000 42,124,000 45,901,000 47,202,000 41,197,000 33,722,000 30,964,000 25,246,000 23,699,000 21,895,000 30,510,000 44,201,000 40,125,000 44,009,000 38,923,000 39,687,000 35,520,000 38,042,000 40,055,000 39,893,000 44,639,000 42,200,000 38,063,000 36,283,000 29,303,000 37,495,000 34,204,000 26,456,000        
        non-current investments, amortized cost of 613,838 and 431,633 in 2020 and 2019, respectively, allowance for expected credit losses of 75 and 0 in 2020 and 2019, respectively
                            619,343,000                                                                        
        preferred stock, .01 par value – authorized: 400 shares in 2020 and 2019, respectively, no shares issued and outstanding
                                                                                                    
        current investments, amortized cost of 141,874 and 235,610 in 2020 and 2019, respectively, allowance for expected credit losses of 0 in 2020 and 2019
                             143,084,000                                                                       
        non-current investments, amortized cost of 461,948 and 431,633 in 2020 and 2019, respectively, allowance for expected credit losses of 75 and 0 in 2020 and 2019, respectively
                             467,087,000                                                                       
        current investments, amortized cost of 155,671 and 235,610 in 2020 and 2019, respectively, allowance for expected credit losses of 0 in 2020 and 2019
                              159,244,000                                                                      
        non-current investments, amortized cost of 450,719 and 431,633 in 2020 and 2019, respectively, allowance for expected credit losses of 160 and 0 in 2020 and 2019, respectively
                              446,955,000                                                                      
        preferred stock,.01 par value - authorized: 400 shares in 2019 and 2018, respectively, no shares issued and outstanding
                                                                                                    
        preferred stock, .01 par value – authorized: 400 shares in 2019 and 2018, respectively, no shares issued and outstanding
                                                                                                    
        short-term investments
                                   427,348,000 420,016,000 353,740,000 337,629,000 297,961,000 273,261,000 342,402,000 376,027,000 341,194,000 328,378,000 294,593,000 319,789,000 296,468,000 272,584,000 223,464,000 142,343,000 90,456,000 49,758,000 83,677,000 41,777,000 184,822,000 186,572,000 135,289,000 125,411,000 105,105,000 101,870,000 59,943,000 159,209,000 144,431,000 142,409,000 202,012,000 170,342,000 147,823,000 113,516,000 97,350,000 55,330,000 55,563,000 55,527,000 54,594,000 52,494,000 52,559,000 64,091,000 77,052,000 73,469,000 113,179,000 87,824,000 81,857,000 115,463,000  120,638,000 134,781,000 169,162,000 140,959,000 133,677,000 217,244,000 181,764,000 167,052,000 80,752,000 66,709,000 61,709,000 68,451,000 83,075,000  90,147,000 78,513,000 
        long-term investments
                                   262,039,000 281,929,000 271,941,000 356,181,000 423,441,000 386,501,000 354,658,000 312,850,000 324,335,000 315,927,000 307,703,000 249,760,000 273,088,000 240,504,000 233,752,000 370,433,000 400,845,000 409,283,000 343,725,000 379,916,000 229,655,000 226,720,000 243,108,000 245,484,000 238,255,000 259,910,000 124,748,000 183,965,000 174,906,000 173,521,000 108,700,000 109,069,000 102,055,000 88,590,000 64,549,000 33,107,000 26,633,000 23,226,000 26,377,000 31,334,000 41,389,000 47,080,000 54,038,000 41,931,000 50,565,000 70,200,000 85,444,000 59,422,000  56,773,000 60,276,000 52,408,000 79,732,000 87,054,000 122,149,000 135,324,000 123,434,000 147,925,000 172,671,000 167,200,000 161,090,000 140,963,000 172,681,000 171,833,000 182,542,000 
        other non-current liabilities
                                   3,866,000 5,474,000 4,634,000 4,780,000 5,904,000 9,905,000 9,281,000 3,875,000 4,871,000 1,615,000 2,630,000 3,046,000 3,252,000 2,852,000                                                    
        shareholders’ equity :
                                                                                                    
        prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the fourth quarter of 2017.
                                                                                                    
        held for sale assets
                                                 38,927,000                                                   
        held for sale liabilities
                                                 14,598,000                                                   
        deferred revenue
                                                 18,994,000 20,447,000  24,253,000 25,327,000                            10,319,000 8,197,000 6,884,000 6,178,000 6,718,000 7,011,000 5,612,000 6,418,000 6,585,000 7,453,000 6,222,000 6,028,000 6,864,000 6,088,000 4,659,000 3,353,000  2,926,000 3,075,000 
        deferred costs
                                                     20,877,000                                               
        authorized: 140,000 shares, issued: 43,452 and 43,055 shares in 2013 and 2012, respectively
                                                          87,000                                          
        authorized: 140,000 shares, issued: 42,223 and 41,065 shares in 2011 and 2010, respectively
                                                               84,000                                     
        accumulated other comprehensive gain, net of tax
                                                                 4,567,000                                   
        authorized: 140,000 shares, issued: 41,065 and 39,665 shares in 2010 and 2009, respectively
                                                                   82,000                                 
        accumulated other comprehensive loss
                                                                    -6,333,000 -22,742,000 -10,265,000   -5,843,000 -14,680,000 -5,509,000 -2,910,000   -1,896,000 -5,579,000 -10,097,000 -9,815,000 -10,626,000 -12,517,000 -12,396,000 -13,693,000 -13,880,000 -13,932,000 -14,708,000  -12,304,000 -9,780,000 -8,337,000 -8,709,000 -7,297,000 -4,144,000  -5,248,000 -6,342,000 
        authorized: 140,000 shares, issued: 39,665 and 39,655 shares in 2009 and 2008, respectively
                                                                       79,000                             
        authorized: 140,000 shares, issued: 39,662 and 39,655 shares in 2009 and 2008, respectively
                                                                        79,000                            
        accumulated other comprehensive income
                                                                        277,000                            
        authorized: 140,000 shares, issued: 39,655 shares in 2009 and 2008
                                                                          79,000                          
        authorized: 140,000 shares, issued: 39,655 and 43,347 shares in 2008 and 2007, respectively
                                                                           79,000                         
        held-for-sale assets
                                                                             3,170,000                       
        accumulated other comprehensive gain
                                                                             6,594,000 10,016,000                      
        authorized: 140,000 shares, issued: 41,897 and 43,347 shares in 2008 and 2007, respectively
                                                                              84,000                      
        commitments
                                                                                                    
        customer deposits
                                                                                 1,673,000 1,965,000 842,000 1,655,000 1,663,000 1,736,000 2,784,000 3,171,000 3,301,000 2,436,000 2,506,000 2,641,000 4,900,000 4,911,000 3,733,000 3,519,000  3,339,000 2,943,000 
        authorized: 140,000 shares, issued: 43,224 and 44,403 shares in 2007 and 2006, respectively
                                                                                 86,000                   
        authorized: 140,000 shares, issued: 44,345 and 44,403 shares in 2007 and 2006, respectively
                                                                                  89,000                  
        short–term investments
                                                                                   128,319,000                 
        long–term investments
                                                                                   50,540,000                 
        authorized: 140,000 shares, issued: 44,403 and 47,171 shares in 2006 and 2005, respectively
                                                                                   89,000                 
        additional paid–in capital
                                                                                   155,136,000                 
        authorized: 140,000 shares, issued: 47,274 and 46,155 shares in 2005 and 2004, respectively
                                                                                       94,000             
        authorized: 140,000 shares, issued: 46,295 and 46,155 shares in 2005 and 2004, respectively
                                                                                         93,000           
        liabilities and stockholders' equity
                                                                                                    
        stockholders’ equity:
                                                                                                    
        treasury stock
                                                                                            -72,765,000  -72,306,000 -72,311,000     
        total stockholders' equity
                                                                                          457,214,000          
        liabilities and stockholders’ equity
                                                                                                    
        authorized: 140,000 shares, issued: 45,973 and 48,186 shares in 2004 and 2003, respectively
                                                                                           92,000         
        total stockholders’ equity
                                                                                           446,834,000 416,521,000        
        authorized: 140,000 shares, issued: 49,239 and 48,186 shares in 2004 and 2003, respectively
                                                                                            98,000        
        liabilities and stockholders’ equity
                                                                                                    
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-04-05 2025-12-31 2025-09-28 2025-06-29 2025-03-30 2024-12-31 2024-09-29 2024-06-30 2024-03-31 2023-12-31 2023-10-01 2023-07-02 2023-04-02 2022-12-31 2022-10-02 2022-07-03 2022-04-03 2021-12-31 2021-10-03 2021-07-04 2021-04-04 2020-12-31 2020-09-27 2020-06-28 2020-03-29 2019-12-31 2019-09-29 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-07-01 2018-04-01 2017-12-31 2017-10-01 2017-07-02 2017-04-02 2016-12-31 2016-10-02 2016-07-03 2016-04-03 2015-12-31 2015-10-04 2015-07-05 2015-04-05 2014-12-31 2014-09-28 2014-06-29 2014-03-30 2013-12-31 2013-09-29 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-07-01 2012-04-01 2011-12-31 2011-10-02 2011-07-03 2011-04-03 2010-12-31 2010-10-03 2010-07-04 2010-04-04 2009-12-31 2009-10-04 2009-07-05 2009-04-05 2008-12-31 2008-09-28 2008-06-29 2008-03-30 2007-12-31 2007-09-30 2007-07-01 2007-04-01 2006-12-31 2006-10-01 2006-07-02 2006-04-02 2005-10-02 2005-07-03 2005-04-03 2004-10-03 2004-07-04 2004-04-04 2003-09-28 2003-06-29 2003-03-30 2002-09-29 2002-06-30 2002-03-31 
                                                                                                     
          cash flows from operating activities:
                                                                                                     
          net income
        51,704,000 32,664,000 17,664,000 40,511,000 23,603,000 28,346,000 29,591,000 36,212,000 12,022,000 11,229,000 18,916,000 57,474,000 25,615,000 55,311,000 33,980,000 58,901,000 67,333,000 53,535,000 78,900,000 77,598,000 69,848,000 69,345,000 87,506,000 -1,142,000 20,477,000 80,327,000 41,685,000 48,749,000 33,104,000 45,418,000 80,436,000 56,196,000 37,217,000 -26,897,000 102,348,000 56,072,000 45,655,000 38,253,000 53,675,000 42,759,000 14,885,000 18,746,000 104,112,000 43,714,000 20,502,000 26,631,000 50,400,000 25,948,000 18,506,000 20,443,000 20,727,000 16,820,000 15,583,000 16,244,000 17,805,000 19,767,000 14,282,000 19,099,000 18,037,000 19,097,000 13,636,000 19,764,000 18,145,000 14,927,000 8,545,000 459,000 4,501,000 -6,419,000 -3,410,000 1,814,000 11,333,000 5,653,000 8,475,000  7,343,000 3,827,000 4,635,000 9,505,000 10,116,000 11,434,000 8,800,000 10,858,000 7,800,000 5,294,000 11,655,000 10,878,000 8,567,000 5,138,000 3,306,000 1,793,000 781,000 -4,712,000 -2,520,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                                     
          stock-based compensation expense
        11,933,000 13,868,000 12,416,000 12,294,000 9,939,000 13,076,000 13,101,000 12,964,000 13,302,000 13,250,000 12,365,000 12,574,000 16,579,000 13,086,000 13,366,000 12,997,000 15,056,000 10,421,000 10,614,000 10,730,000 12,009,000 10,585,000 9,268,000 8,018,000 14,790,000 12,147,000 10,194,000 10,967,000 12,281,000 9,751,000 9,143,000 9,002,000 13,194,000 8,587,000 8,026,000 7,846,000 7,483,000 4,675,000 4,622,000 4,457,000 6,804,000 4,204,000 4,387,000 4,631,000 6,946,000 3,900,000 3,298,000 3,956,000 4,004,000 2,321,000 2,220,000 2,781,000 3,298,000 1,725,000 1,492,000 1,989,000 3,314,000 2,239,000 1,520,000   1,355,000 1,278,000 427,000 -33,000 4,135,000 1,444,000 1,789,000 1,855,000 2,919,000 2,916,000 2,523,000 1,873,000 3,470,000 2,724,000 2,529,000 2,992,000  3,475,000               
          depreciation of property, plant, and equipment
        4,703,000 4,768,000 4,894,000 5,321,000 5,306,000 5,367,000 5,432,000 5,193,000 5,279,000 4,713,000 4,380,000 4,191,000 3,986,000 4,171,000 4,062,000 3,997,000 4,117,000 3,975,000 4,131,000 4,251,000 4,259,000 5,672,000 5,305,000 5,531,000 5,631,000 5,727,000 5,263,000 5,362,000 5,175,000 4,999,000 4,600,000 4,444,000 4,430,000 3,872,000 3,523,000 3,205,000 3,083,000 3,127,000 2,974,000 2,820,000 2,757,000 2,645,000 2,407,000 2,470,000 2,346,000 2,249,000 2,143,000 2,061,000 1,990,000 1,916,000 1,793,000 1,768,000 1,828,000 1,744,000 1,797,000 1,629,000 1,551,000 1,447,000 1,413,000 1,373,000 1,296,000                     1,310,000            
          amortization of intangible assets
        2,532,000 2,559,000 2,639,000 2,678,000 2,628,000 2,492,000 3,386,000 2,727,000 2,813,000 2,182,000 743,000 743,000 942,000 806,000 806,000 822,000 840,000 894,000 920,000 926,000 927,000 927,000 855,000 1,194,000 1,388,000 1,254,000 581,000 769,000 769,000 769,000 769,000 769,000 769,000 769,000 799,000 868,000 872,000 810,000 719,000 817,000 1,045,000 1,047,000 1,020,000 1,090,000 1,093,000 1,090,000 1,104,000 914,000 916,000 917,000 959,000 960,000 961,000 1,013,000 1,038,000 1,043,000 1,043,000 1,046,000 1,051,000 1,051,000 1,079,000                     1,418,000            
          excess and obsolete inventory charges
        364,000 13,061,000 1,872,000 513,000 197,000 537,000 625,000 872,000 471,000 2,072,000 260,000 655,000 788,000 356,000 1,987,000 362,000 379,000 453,000 304,000 1,111,000 705,000 522,000 603,000                                                                       
          loss on sale of business, net of transaction costs
        1,539,000                                                                                             
          deferred income taxes
        4,740,000                                                                                             
          other adjustments
        -380,000                                                                                             
          change in operating assets and liabilities:
                                                                                                     
          accounts receivable
        -23,711,000 8,056,000 28,718,000 -20,949,000 -17,183,000 11,541,000 4,115,000 -22,115,000 -25,669,000 29,834,000 17,932,000 -5,965,000 -18,455,000 -27,564,000 75,136,000 -19,418,000 -24,700,000 -208,000 19,193,000 -19,993,000 -3,495,000 2,593,000 -14,921,000 -11,139,000 2,182,000 5,420,000 4,000 -1,444,000 12,827,000 16,269,000 643,000 -43,609,000 24,830,000 3,194,000 -39,538,000 -16,603,000 -2,238,000 24,551,000 -20,065,000 -16,712,000 -1,025,000 27,430,000 -25,993,000   51,046,000 -35,009,000                                               
          unbilled revenue
        593,000 -53,000 -14,717,000 594,000 307,000 -991,000 -229,000 874,000 -347,000 -789,000 638,000 69,000 -173,000 46,000 56,000 -440,000 2,144,000 3,326,000 -5,533,000 -114,000 3,958,000 9,758,000 -14,410,000 4,507,000 -703,000 6,430,000 -911,000 -99,000 -1,890,000 5,636,000 -10,345,000 414,000 3,389,000 41,406,000 -42,695,000 -4,268,000 953,000 7,678,000 15,521,000                                                       
          inventories
        8,000 -7,015,000 -1,066,000 7,470,000 5,474,000 -4,677,000 2,279,000 12,083,000 -10,938,000 -9,637,000 -7,973,000 357,000 -5,338,000 -13,119,000 -15,693,000 3,778,000 -23,900,000 -32,386,000 -13,013,000 -8,198,000 -1,323,000 -7,254,000 -1,401,000 -6,618,000 4,954,000 5,118,000 7,625,000 6,321,000 4,073,000 10,753,000 -4,479,000 4,101,000 -27,321,000 -18,538,000 -10,839,000 -2,325,000 -5,386,000 -371,000 -1,184,000 9,318,000 2,646,000 1,906,000 -163,000   -5,195,000 -1,405,000                                               
          prepaid expenses and other current assets
        -12,212,000 -3,200,000 11,219,000 -4,890,000 2,526,000 2,934,000 5,170,000 -3,195,000 -3,395,000 4,476,000 3,282,000 -5,520,000 231,000 39,819,000 -1,065,000 -49,964,000 4,212,000 -7,735,000 4,223,000 -17,948,000 -10,882,000 809,000 14,743,000 -15,673,000 -9,788,000 1,578,000 6,290,000 -3,654,000 3,191,000 -6,313,000 19,675,000 -22,246,000 -866,000  12,749,000 -15,391,000 -12,326,000                                                         
          accounts payable
        9,390,000 4,780,000 3,352,000 -1,421,000 4,996,000 8,785,000 6,781,000 -4,612,000 7,398,000 -9,758,000 -2,997,000 -797,000 -192,000 4,300,000 1,948,000 -24,233,000 708,000 17,252,000 -5,482,000 11,298,000 4,760,000 -5,275,000 3,444,000 1,756,000 -1,613,000 5,031,000 1,130,000 -8,773,000 4,245,000 -6,065,000 9,707,000 -16,198,000 5,309,000 -6,810,000 7,318,000 4,647,000 7,167,000 -2,000 -4,135,000 4,008,000 2,216,000 -2,049,000                                                    
          accrued expenses
        -13,554,000 5,428,000 8,189,000 8,395,000 -6,055,000 -2,426,000 -892,000 6,704,000 -470,000 -22,095,000 -3,995,000 723,000 -9,942,000 25,869,000 -3,789,000 8,694,000 -28,718,000 12,445,000 4,210,000 16,179,000 -15,973,000 7,514,000 1,222,000 3,086,000 12,720,000 2,889,000 443,000 -562,000 -11,708,000 -1,886,000 7,932,000 4,261,000 -9,927,000 5,657,000 8,976,000 3,241,000 -3,398,000 211,000 5,798,000 5,115,000 -3,353,000 1,179,000 -123,000   1,591,000                                                
          accrued income taxes
        -2,905,000 6,432,000 -2,636,000 -17,449,000 -3,153,000 1,782,000 3,245,000 -19,563,000 5,258,000 -3,232,000 171,000 -18,405,000 4,721,000 6,200,000 -6,272,000 -17,117,000 16,745,000 -1,465,000 652,000 -7,239,000 1,651,000 654,000 1,784,000 -33,061,000 7,650,000 26,309,000 2,957,000 -499,000 -3,501,000 -4,406,000 -12,137,000 -5,546,000 186,000 68,094,000 3,799,000 -989,000 423,000 2,641,000 -2,776,000 1,778,000 467,000 -8,075,000 9,313,000   369,000                                                
          deferred revenue and customer deposits
        12,889,000 -2,678,000 -28,899,000 12,638,000 14,761,000 -4,513,000 -11,077,000 637,000 8,737,000 -8,971,000 -3,311,000 -13,843,000 17,003,000 -15,996,000 -20,653,000 22,823,000 18,712,000 -2,334,000 -38,469,000 24,579,000 30,641,000 -12,495,000 -13,520,000 20,625,000 11,961,000 3,177,000 -7,877,000 1,815,000 6,760,000 -3,407,000 -27,629,000 26,593,000 5,877,000 -6,025,000 -2,050,000 3,616,000 5,494,000 -7,259,000 73,000                                                       
          other
        -2,540,000 -981,000 127,000 -1,402,000 2,033,000 -2,739,000 771,000 2,921,000 987,000 1,517,000 368,000 603,000 1,744,000 -16,112,000 1,376,000 3,613,000 -958,000 114,000 1,586,000 1,996,000 -285,000 3,526,000 -1,498,000 3,617,000 -1,097,000 6,356,000 -673,000 -751,000 -439,000 766,000 -1,766,000 586,000 -424,000 -7,536,000 1,853,000 742,000 -734,000 2,280,000 1,118,000 -10,234,000 3,327,000 3,241,000 6,226,000   -8,375,000 -814,000                               -1,044,000 -2,000 33,000 17,000 39,000 79,000 191,000 11,000 483,000 -561,000       
          net cash from operating activities
        45,093,000 74,902,000 87,485,000 42,625,000 40,502,000 51,404,000 56,271,000 27,763,000 13,643,000 14,491,000 41,023,000 29,849,000 27,553,000 66,257,000 83,520,000 44,112,000 49,517,000 55,209,000 64,131,000 96,086,000 98,639,000 82,950,000 80,430,000 13,878,000 65,142,000 67,911,000 65,164,000 58,889,000 61,261,000 71,762,000 79,076,000 17,830,000 54,786,000 84,269,000 49,434,000 42,905,000 47,715,000 75,423,000 57,347,000 21,731,000 27,580,000 44,305,000 65,413,000 8,909,000 -264,000 92,983,000 31,279,000 14,247,000 17,461,000 36,220,000 20,260,000 20,185,000 18,790,000 26,322,000 34,637,000 27,318,000 12,854,000 23,724,000 14,291,000 27,296,000 20,783,000 29,595,000 25,471,000 11,566,000 9,711,000 11,861,000 3,768,000 -3,864,000 518,000 20,194,000 10,748,000 14,305,000 13,690,000 12,476,000 18,008,000 11,501,000 6,488,000 5,946,000 15,950,000 12,223,000 14,360,000 15,668,000 7,181,000 7,819,000 24,296,000 12,142,000 13,700,000 9,347,000 5,805,000 4,844,000 2,901,000 5,518,000 -1,271,000 
          cash flows from investing activities:
                                                                                                     
          purchases of investments
        -47,013,000 -40,753,000 -34,717,000 -101,457,000 -113,297,000 -201,832,000 -379,160,000 -36,134,000 -233,726,000 -9,726,000 -80,270,000 -47,580,000 -46,480,000 -155,960,000 -38,605,000 -39,155,000 -60,595,000 -95,833,000 -212,714,000 -298,911,000 -321,420,000 -283,907,000 -118,010,000 -199,530,000 -148,279,000 -218,467,000 -406,300,000 -258,596,000 -165,985,000 -279,858,000 -218,081,000 -118,108,000 -221,348,000 -110,897,000 -110,999,000 -193,612,000 -152,913,000 -143,040,000 -236,299,000 -219,616,000 -139,097,000 -324,719,000 -65,751,000 -157,083,000 -138,651,000 -94,236,000 -65,012,000 -124,734,000 -119,748,000 -83,381,000 -90,958,000 -76,694,000 -105,135,000 -246,247,000 -52,383,000 -56,721,000 -35,901,000 -119,880,000 -103,895,000 -64,270,000                                 
          maturities and sales of investments
        39,042,000 17,037,000 54,672,000 99,685,000 148,885,000 206,130,000 356,150,000 76,332,000 189,758,000 94,302,000 286,399,000 69,562,000 46,199,000 38,107,000 51,266,000 51,634,000 112,976,000 113,795,000 46,478,000 110,144,000 160,552,000 537,360,000 179,480,000 125,639,000 262,126,000 281,033,000 194,754,000 393,603,000 193,572,000 177,446,000 204,111,000 286,671,000 144,337,000 156,388,000 148,422,000 107,987,000 171,667,000 128,043,000 102,011,000 203,862,000 223,334,000 79,977,000 268,696,000 122,292,000 130,476,000 100,074,000 62,116,000 59,527,000 117,753,000 117,719,000 49,043,000 81,081,000 48,248,000 122,429,000 66,129,000 205,764,000 37,188,000    40,096,000                                 
          net proceeds from sale of business
        11,519,000                                                                                             
          purchases of property, plant, and equipment, net of proceeds
        -2,757,000                                                                                             
          net cash from investing activities
        791,000 -19,608,000 18,503,000 -3,966,000 33,087,000 2,225,000 -27,409,000 35,238,000 -49,023,000 -179,495,000 200,274,000 17,282,000 -5,788,000 -126,965,000 46,914,000 6,361,000 69,236,000 48,434,000 -53,494,000 -106,684,000 -140,795,000 213,470,000 -107,271,000 3,718,000 59,522,000 -42,384,000 -28,262,000 -16,588,000 -70,102,000 -2,543,000 -81,428,000 60,185,000 12,959,000 -73,670,000 31,054,000 -34,432,000 -28,507,000 -38,997,000 -48,656,000 -35,660,000 1,481,000 -64,439,000 43,958,000 40,805,000 -30,871,000 -50,433,000 -35,857,000 -8,141,000 -9,666,000 -9,257,000 -36,180,000 -12,279,000 -30,354,000 15,037,000 -182,435,000 150,564,000 -22,020,000 -13,933,000 -19,108,000 -31,236,000 -25,751,000 -54,090,000 -39,366,000 -75,460,000 -7,570,000 -5,379,000 -4,427,000 1,588,000 7,752,000 15,591,000 18,276,000 -16,052,000 46,723,000 -7,595,000 8,510,000 5,549,000 2,236,000 -2,738,000 16,457,000 22,227,000 16,579,000 -1,781,000 6,200,000 -5,223,000 -27,934,000 -65,371,000 -2,544,000 -12,078,000 -8,645,000 -16,201,000 33,245,000 1,290,000 -991,000 
          cash flows from financing activities:
                                                                                                     
          net payments from issuance of common stock under stock plans
        44,290,000 1,707,000 260,000 175,000 -2,587,000 1,199,000 1,666,000 990,000 -2,861,000 -8,000 621,000 5,710,000 -3,055,000 5,636,000                                                                                
          repurchase of common stock
        -98,995,000 -25,000,000 -24,000,000 -102,233,000 -43,244,000 -3,962,000 -10,540,000 -9,339,000 -20,154,000 -10,477,000 -24,985,000 -24,178,000 -25,927,000 -24,070,000 -23,912,000 -130,405,000 -113,358,000 -27,417,000 -14,398,000 -6,479,000 -51,036,000   -61,560,000 -20,954,000 -52,106,000 -69,202,000 -24,368,000 -37,004,000 -32,276,000 -30,067,000 -28,208,000 -10,223,000   -90,503,000   -24,533,000 -8,136,000 -12,717,000 -14,287,000 -19,849,000 -16,168,000                  -24,551,000 -22,798,000 -12,932,000 -32,688,000 -29,993,000 -2,670,000 -5,000,000 -19,413,000 -36,856,000 -25,027,000             
          payment of dividends
        -14,196,000 -14,203,000 -13,443,000 -13,431,000 -13,550,000 -13,710,000 -12,863,000 -12,868,000 -12,888,000 -12,870,000 -12,049,000 -12,069,000 -12,091,000 -12,084,000 -11,264,000 -11,270,000 -11,303,000 -11,463,000 -10,608,000 -10,597,000 -10,595,000 -361,954,000 -9,582,000 -9,469,000 -9,503,000 -9,442,000 -8,536,000 -8,582,000 -8,564,000 -8,582,000 -7,759,000 -7,737,000 -7,787,000 -7,801,000 -7,372,000 -7,367,000 -6,497,000 -6,452,000 -6,426,000 -6,385,000 -5,950,000 -5,925,000 -6,027,000           -52,507,000 -4,721,000 -4,714,000 -4,271,000 -4,217,000 -3,801,000 -3,780,000 -3,316,000 -3,267,000 -2,382,000 -2,382,000 -1,983,000 -1,983,000 -1,983,000 -1,983,000 -5,948,000 -5,939,000 -6,129,000 -3,555,000 -3,658,000 -3,683,000 -3,681,000 -3,756,000 -3,778,000 -3,791,000 -3,806,000 -3,676,000 -3,785,000 -3,768,000 -3,707,000 -3,698,000 -3,680,000 -2,714,000 -2,676,000       
          net cash from financing activities
        -68,901,000 -37,496,000 -37,571,000 -13,256,000 -118,370,000 -55,755,000 -15,159,000 -22,418,000 -25,088,000 -33,032,000 -21,905,000 -31,344,000 -39,324,000 -32,375,000 -35,523,000 -34,362,000 -138,114,000 -120,630,000 -23,331,000 -15,332,000 17,670,000 -327,629,000 33,573,000 27,756,000 -50,568,000 23,359,000 -3,173,000 -58,201,000 5,782,000 -69,241,000 -17,642,000 -57,155,000 -65,866,000 -22,362,000 -36,602,000 -33,732,000 -7,425,000 -14,283,000 -2,258,000   -5,756,000 -89,968,000 -24,503,000 13,360,000 -22,561,000 2,186,000 -8,326,000 -6,171,000 -16,973,000 -2,609,000 -3,420,000 10,544,000 -50,280,000 -2,784,000 -3,758,000 11,671,000 -770,000 -5,584,000 9,067,000 7,081,000 19,653,000 4,704,000 -2,220,000 -1,909,000 -10,997,000 -2,191,000 -2,075,000 -6,035,000 -29,692,000 -28,161,000 -4,691,000 -32,983,000 -3,280,000 -1,845,000 -30,154,000 -5,222,000 -6,320,000 -21,363,000 -39,321,000 -22,578,000 13,261,000 -2,030,000 -1,156,000 -1,727,000 17,407,000 17,731,000 10,078,000 3,307,000 1,186,000 -23,756,000 1,738,000 1,131,000 
          effect of foreign exchange rate changes on cash and cash equivalents
        -2,565,000 -771,000 -1,830,000 10,164,000 2,431,000 -8,855,000 6,746,000 -2,816,000 -3,328,000 5,190,000 -1,376,000 -2,473,000 356,000 8,453,000 -5,953,000 -4,834,000 -1,031,000 -331,000 -864,000 279,000 -1,899,000 1,926,000 5,603,000 1,472,000 -6,330,000 844,000 -1,132,000 -292,000 143,000 863,000 -1,837,000 -1,230,000 1,111,000 6,996,000 -803,000 1,097,000 1,004,000 -3,647,000 -217,000 -876,000 1,388,000 -1,698,000 -1,531,000 433,000 -1,872,000 -2,474,000 399,000 -71,000 195,000 208,000 1,101,000   -77,000 -1,252,000                                       
          net change in cash and cash equivalents
        -25,582,000 17,027,000 66,587,000 35,567,000 -42,350,000 -10,981,000 20,449,000 37,767,000 -63,796,000 -192,846,000 218,016,000 13,314,000 -17,203,000 -84,630,000 88,958,000 11,277,000 -20,392,000 -17,318,000 -13,558,000 -25,651,000 -26,385,000 -29,283,000 12,335,000 46,824,000 67,766,000 49,730,000 32,597,000 -16,192,000 -2,916,000 841,000 -21,831,000 19,630,000 2,990,000 -4,767,000 43,083,000 -24,162,000 12,787,000 18,496,000 6,216,000 -24,985,000 27,939,000 -27,588,000 17,872,000 25,644,000 -19,647,000 17,515,000 -1,993,000 -2,291,000 1,819,000 10,198,000 -17,428,000 5,117,000 -2,403,000 -8,998,000 -151,834,000 164,433,000 3,456,000                                     
          cash and cash equivalents at beginning of period
        262,925,000  186,094,000  202,655,000  181,374,000  186,161,000  269,073,000  171,431,000  108,212,000  106,582,000  79,641,000  51,975,000  55,694,000  40,644,000  45,160,000  38,103,000  33,203,000  119,831,000  127,138,000  104,144,000  87,361,000  72,856,000 54,270,000 76,227,000 60,864,000 31,660,000 
          cash and cash equivalents at end of period
        237,343,000  66,587,000 35,567,000 143,744,000  20,449,000 37,767,000 138,859,000  218,016,000 13,314,000 164,171,000  88,958,000 11,277,000 165,769,000  -13,558,000 -25,651,000 242,688,000  12,335,000 46,824,000 239,197,000  32,597,000 -16,192,000 105,296,000  -21,831,000 19,630,000 109,572,000  43,083,000 -24,162,000 92,428,000  6,216,000 -24,985,000 79,914,000  17,872,000 25,644,000 36,047,000  -1,993,000 -2,291,000 42,463,000  -17,428,000 5,117,000 42,757,000  -151,834,000 164,433,000 41,559,000  -12,501,000 5,662,000 37,014,000  271,000 -76,722,000 114,664,000  1,708,000 2,434,000 123,020,000  -6,269,000 -8,101,000 139,464,000  28,578,000 -12,901,000 91,666,000  10,500,000 -2,830,000 81,880,000 27,266,000 9,697,000 55,062,000 -5,648,000 -35,229,000 105,982,000 7,549,000 473,000 50,969,000 13,025,000 2,964,000 31,119,000 
          loss on disposal of property, plant, and equipment
         158,000       231,000 6,000   7,000   29,000 1,000 3,000                                                                         
          gain from sale of training center property
                                                                                                     
          fair value adjustment on acquired inventories
             1,224,000                                                                                     
          amortization of discounts or (premiums) on investments
                                                                                                     
          realized loss on sale of investments
         -6,000 -96,000 -27,000 -27,000 10,000 -2,000 1,330,000    79,000 79,000 -12,000 36,000        -1,850,000 -736,000 -294,000 -382,000 -40,000 34,000 -266,000 -247,000 -22,000 -459,000 -263,000 -42,000 -65,000 -773,000 -605,000 -141,000 13,000                -94,000                                     
          change in deferred income taxes
         2,406,000 43,934,000 -1,504,000 -4,689,000 -8,067,000 -5,902,000 -4,205,000 -3,333,000 -5,088,000 -533,000 -3,502,000 -10,656,000 -12,539,000 -3,990,000 -6,918,000 -3,891,000 -4,529,000 438,000 -277,000 1,250,000 -6,547,000 1,799,000 3,221,000 -1,826,000 -93,061,000 -494,000 -171,000 -1,140,000 -588,000 2,560,000 -916,000 -1,469,000 3,617,000 -4,828,000 2,077,000 921,000 -493,000 1,528,000 -879,000 -2,064,000 725,000 -124,000 -759,000 -1,251,000 595,000 -1,452,000 -1,634,000 127,000 2,018,000 1,964,000 -377,000 -1,371,000 1,938,000 -433,000 -897,000 -179,000 -66,000 283,000 -170,000 -472,000 3,431,000                                
          changes in operating assets and liabilities:
                                                                                                     
          proceeds from sale of training center property
                                                                                                     
          purchases of property, plant, and equipment, net of proceeds from disposals
                                                                                                     
          net payments related to business acquisitions
             -450,000 -994,000                                                                                     
          payment of excise tax on prior year common stock repurchases
                                                                                                    
          cash and cash equivalents at beginning of year
                                                                                                     
          cash and cash equivalents at end of year
                                                                                                     
          amortization of discounts or premiums on investments
          -125,000 -153,000 -161,000 -131,000 -125,000 256,000 306,000 398,000 147,000 500,000 700,000 992,000 1,262,000 1,312,000 1,402,000 1,571,000 1,476,000 1,254,000 586,000 509,000 437,000 222,000 106,000 -55,000 -221,000 1,119,000 -1,461,000 -15,000 29,000 38,000 56,000 17,000 17,000 85,000 86,000 95,000 84,000 79,000 125,000 154,000 159,000 174,000 203,000 227,000 312,000 388,000 896,000 523,000 553,000 685,000 758,000 1,016,000 1,137,000 1,747,000 1,835,000                                     
          purchases of property, plant, and equipment
          -1,452,000 -2,194,000 -2,501,000 -2,073,000 -4,399,000 -4,510,000 -4,061,000 -7,015,000 -5,855,000 -4,700,000 -5,507,000 -4,062,000 -4,352,000 -6,668,000 -4,585,000 -4,766,000 -4,139,000 -4,114,000 -2,436,000 -3,474,000 -2,844,000 -3,911,000 -3,074,000 -8,227,000 -4,549,000 -3,891,000 -5,078,000 -9,739,000 -5,681,000 -8,405,000 -13,270,000 -8,710,000 -7,872,000 -6,077,000 -6,095,000 -2,325,000 -5,144,000 -3,110,000 -2,237,000 -5,211,000 -3,492,000 -5,261,000 -4,264,000 -11,856,000 -3,737,000 -2,656,000 -2,685,000 -3,478,000 -1,842,000 -2,402,000 -1,908,000 -2,257,000 -2,317,000 -2,817,000 -2,487,000 -2,275,000 -1,920,000 -2,048,000 -1,577,000                                 
          non-cash impact of charges related to fire
                                                                                                     
          non-cash impact of write-offs related to fire
                      924,000                                                                               
          intangible asset impairment charges
                                                                                                   
          operating lease asset impairment charges
                             893,000                                                                       
          revaluation of contingent consideration
                               -538,000 122,000 -985,000 47,000 204,000 188,000 -442,000 -116,000 239,000 124,000 -275,000 -200,000 -263,000                                                     
          payment of contingent consideration
                                                                                              
          net proceeds from issuance of common stock under stock plans
                       820,000 3,594,000 4,191,000 14,694,000 9,663,000 34,744,000                                                                         
          realized gain on sale of investments
                         -149,000 -19,000   -528,000 -786,000                    -19,000 -192,000 -29,000  -45,000 -105,000 -501,000  -20,000 -52,000 -31,000  -340,000                                       
          business acquisitions
                                                                                                     
          credit loss on investments
                              -85,000 160,000                                                                     
          issuance of common stock under stock plans
                             34,325,000 43,155,000 38,264,000 9,971,000 32,801,000 5,363,000 12,071,000 14,346,000 901,000 11,071,000 3,688,000 11,123,000 9,807,000 9,700,000 5,911,000 29,139,000 20,377,000 14,391,000 5,260,000 3,440,000 142,000                                                    
          impairment of intangible assets
                                                                                                     
          cash paid for acquisition of business, net of cash acquired
                                                                                                     
          net cash paid from sale of discontinued business
                                                                                                     
          loss on sale of discontinued business
                                                                                                   
          cash paid for acquisition of business
                                            -176,000                                                        
          legal fees paid from sale of discontinued business
                                                                                                     
          cash paid related to discontinued business
                                          -291,000                                                         
          cash paid for purchased technology
                                                                                                   
          net cash received from sale of discontinued business
                                                                                                   
          non-cash items related to discontinued operations:
                                                                                                     
          depreciation and amortization expense
                                                                                                   
          capital expenditures
        -2,757,000 -1,452,000 -2,194,000 -2,501,000 -2,073,000 -4,399,000 -4,510,000 -4,061,000 -7,015,000 -5,855,000 -4,700,000 -5,507,000 -4,062,000 -4,352,000 -6,668,000 -4,585,000 -4,766,000 -4,139,000 -4,114,000 -2,436,000 -3,474,000 -2,844,000 -3,911,000 -3,074,000 -8,227,000 -4,549,000 -3,891,000 -5,078,000 -9,739,000 -5,681,000 -8,405,000 -13,270,000 -8,710,000 -7,872,000 -6,077,000 -6,095,000 -2,325,000 -5,144,000 -3,110,000 -2,237,000 -5,261,000 -4,264,000 -11,856,000 -3,737,000 -2,656,000 -2,685,000 -3,478,000 -1,842,000 -2,402,000 -1,908,000 -2,257,000 -2,317,000 -2,817,000 -2,487,000 -2,275,000 -1,920,000 -2,048,000 -1,577,000 -1,076,000 -1,150,000 -1,081,000 -954,000 -1,674,000 -1,097,000 -1,741,000 -1,768,000 -737,000 -1,798,000 -1,709,000 -1,328,000 -746,000 -1,074,000 -1,487,000 -993,000 -1,208,000 -992,000 -1,031,000 -1,095,000 -1,047,000 -767,000 -769,000 -691,000 -570,000 -430,000 -579,000 -561,000 -297,000 -689,000 -642,000 
          free cash flows
        42,336,000 74,902,000 86,033,000 40,431,000 38,001,000 49,331,000 51,872,000 23,253,000 9,582,000 7,476,000 35,168,000 25,149,000 22,046,000 62,195,000 79,168,000 37,444,000 44,932,000 50,443,000 59,992,000 91,972,000 96,203,000 79,476,000 77,586,000 9,967,000 62,068,000 59,684,000 60,615,000 54,998,000 56,183,000 62,023,000 73,395,000 9,425,000 41,516,000 75,559,000 41,562,000 36,828,000 41,620,000 73,098,000 52,203,000 18,621,000 25,343,000 44,305,000 65,413,000 3,648,000 -4,528,000 81,127,000 27,542,000 11,591,000 14,776,000 32,742,000 18,418,000 17,783,000 16,882,000 24,065,000 32,320,000 24,501,000 10,367,000 21,449,000 12,371,000 25,248,000 19,206,000 29,595,000 24,395,000 10,416,000 8,630,000 10,907,000 2,094,000 -4,961,000 -1,223,000 18,426,000 10,011,000 12,507,000 11,981,000 11,148,000 17,262,000 10,427,000 5,001,000 4,953,000 14,742,000 11,231,000 13,329,000 14,573,000 6,134,000 7,052,000 23,527,000 11,451,000 13,130,000 8,917,000 5,226,000 4,283,000 2,604,000 4,829,000 -1,913,000 
          cash paid for acquisition of businesses, net of cash acquired
                                          1,401,000                                                           
          net cash from used in financing activities
                                                -2,510,000                                                     
          net gain on sale of discontinued business
                                                                                                     
          tax effect of stock option exercises
                                                 -27,000 -579,000 -5,664,000 -3,694,000 -693,000 -3,697,000 -1,316,000 -2,165,000 -1,074,000 -3,811,000 -1,397,000 -1,376,000 -338,000 -287,000 -131,000 -2,838,000 -421,000 -1,199,000 -1,545,000 -880,000   113,000 -37,000 5,000 208,000 172,000 87,000                         
          net proceeds from sale of discontinued business
                                                 -108,000                                                    
          gain on sale of discontinued business
                                                                                                     
          deferred revenue
                                                  -2,450,000    -1,063,000                                               
          deferred costs
                                                                                                     
          issuance of common stock under stock option plans
                                                   11,791,000 9,666,000 1,279,000 6,625,000 3,075,000 5,951,000 1,802,000 9,748,000 7,074,000 9,168,000 1,889,000 1,650,000 825,000 13,104,000  7,018,000 11,302,000 9,517,000  6,929,000 275,000 120,000        2,901,000    1,101,000             1,186,000   1,131,000 
          noncash items related to discontinued operations:
                                                                                                     
          change in operating assets and liabilities
                                                    -26,380,000    -6,312,000  -3,930,000 -1,465,000 -860,000  12,428,000 3,148,000 -6,060,000  -8,493,000 3,999,000 2,310,000  4,028,000 -6,862,000 -1,791,000  -6,702,000    -11,232,000 1,386,000 1,610,000  3,674,000 5,656,000 3,601,000                 
          adjustments to reconcile net income to net cash from operations:
                                                                                                     
          net unrealized loss on trading securities
                                                                                                     
          unrealized loss on trading securities
                                                                                                     
          effect of foreign exchange rate changes on cash
                                                            -1,383,000    951,000 -1,093,000 -2,100,000 535,000 1,698,000 -168,000 9,462,000 -10,608,000 -5,399,000 -2,816,000 4,558,000 6,785,000 -6,353,000 -4,049,000 -7,132,000 -1,663,000 7,890,000 -4,800,000 3,905,000    -544,000 2,041,000 663,000 118,000 -1,654,000 -648,000 -283,000 593,000 868,000 202,000      
          return of japan tax deposit
                                                                                                     
          cash received related to discontinued business
                                                                       315,000                            
          stock option buyback
                                                                     -83,000                             
          intangible asset impairment charge
                                                                         1,000,000                        
          cash paid for business acquisitions, net of cash acquired
                                                                                 -500,000                   
          issuance of common stock under stock option and stock purchase plans
                                                                             808,000 725,000   365,000 1,814,000                2,669,000   
          amortization of premiums/discounts on investments
                                                                  1,679,000 1,534,000 1,462,000                                 
          maturities and sale of investments
                                                                  102,692,000                                   
          cash received related to disposition
                                                                                                     
          net decrease in cash and cash equivalents
                                                                        -5,167,000                    -5,648,000     -9,895,000    
          net increase in cash and cash equivalents
                                                                   5,662,000 3,811,000  271,000    1,708,000 2,434,000 -4,118,000 2,044,000 -6,269,000 -8,101,000 35,320,000 -3,199,000 28,578,000 -12,901,000 4,305,000 -2,189,000 10,500,000 -2,830,000 9,024,000 27,266,000 9,697,000 792,000   29,755,000 7,549,000   13,025,000 2,964,000 -541,000 
          stock-based compensation expenses
                                                                    2,352,000                    2,956,000             
          adjustments to reconcile net income to net cash provided by operations:
                                                                                                     
          impairment loss related to discontinued business
                                                                                                   
          amortization of premiums or discounts on investments
                                                                                                     
          provision for excess and obsolete inventory
                                                                     148,000 419,000 403,000 539,000 445,000 544,000 1,432,000 1,057,000     2,045,000                    
          depreciation and amortization
                                                                      3,366,000 3,035,000 2,800,000  2,647,000 2,691,000 2,931,000  2,959,000 2,949,000 2,876,000  2,844,000 2,838,000 2,812,000  2,966,000 2,926,000 2,810,000   2,536,000  2,453,000 2,566,000       
          excess tax benefit from stock option exercises
                                                                             10,000 -41,000 -1,178,000 -462,000 -38,000 -22,000 -56,000 -125,000 -2,408,000 180,000 1,613,000 -798,000             
          purchase of investments
                                                                      -61,480,000 -99,906,000 -16,694,000 -9,734,000 -15,529,000 -6,839,000 -1,677,000 -32,481,000 -27,365,000 -43,954,000 -16,822,000 -57,409,000 -48,445,000 -62,467,000 -109,555,000 -129,558,000 -63,976,000 -121,242,000 -166,310,000 -296,505,000 -154,629,000 -167,137,000 -79,335,000 -95,582,000 -71,993,000 -26,806,000 -51,119,000 -53,194,000 -21,874,000 -25,552,000 -19,063,000 
          maturity and sale of investments
                                                                      23,190,000 25,596,000 9,890,000 5,750,000 17,276,000 9,524,000 11,170,000 49,840,000 43,831,000 30,450,000 65,254,000 51,642,000 57,701,000 69,592,000 113,278,000 127,813,000 81,831,000 147,459,000 183,920,000 295,983,000 273,303,000 162,681,000 52,170,000 30,902,000 70,019,000 15,158,000 50,683,000 37,554,000 55,416,000   
          purchase of property, plant, and equipment
                                                                      -1,076,000 -1,150,000 -1,081,000 -954,000 -1,674,000 -1,097,000 -1,741,000 -1,768,000 -737,000 -1,798,000 -1,709,000 -1,328,000 -746,000 -1,074,000 -1,487,000 -993,000 -1,208,000 -992,000 -1,031,000 -1,095,000 -1,047,000 -767,000 -769,000 -691,000 -570,000 -430,000 -579,000 -561,000 -297,000 -689,000 -642,000 
          cash paid for business acquisition
                                                                                                    
          deferred income tax
                                                                       -477,000 -312,000 4,636,000 1,126,000 -1,731,000 -2,046,000                         
          reversal of accrued inventory purchase commitments
                                                                                                     
          income taxes
                                                                                                     
          cash deposit related to discontinued business
                                                                                                     
          issuance of common stock under stock option/purchase plans
                                                                                                    
          change in operating assets and liabilities.
                                                                            -956,000                         
          deferred income tax benefit
                                                                               -1,051,000 -905,000 -4,330,000 -1,182,000 -2,941,000 -1,443,000                 
          provisions for excess and obsolete inventory
                                                                              513,000 1,036,000 223,000                     
          deferred income tax expense
                                                                                       -2,667,000 -1,469,000   522,000 1,843,000         
          deposit related to japan tax audit
                                                                                  -352,000 -5,984,000                 
          net income.
                                                                                                     
          amortization of investments
                                                                                                     
          tax benefit from stock option exercises
                                                                                                     
          cash paid for business acquisition, net of cash acquired
                                                                                                     
          effect of exchange rate changes on cash
                                                                                    803,000             276,000  -5,582,000 590,000 
          stock—based compensation expense
                                                                                                     
          issuance of common stock under stock option, stock purchase, and other plans
                                                                                                     
          change in current assets and current liabilities
                                                                                      901,000 -4,621,000 2,044,000 -1,472,000 -3,570,000 -1,057,000 8,081,000 -5,295,000 -821,000       
          issuance of stock under stock option plans
                                                                                      1,853,000 1,909,000 5,436,000             
          amortization of investment discounts and premiums
                                                                                         604,000            
          tax benefit from exercise of stock options
                                                                                         3,733,000 170,000 333,000 297,000 4,552,000 3,949,000       
          cash paid for business acquisitions
                                                                                                    
          issuance of stock under stock option, stock purchase, and other plans
                                                                                         17,029,000 1,677,000 2,542,000 1,953,000 20,121,000 20,407,000 12,685,000      
          adjustments to reconcile net income to net cash from operating activities: depreciation and amortization
                                                                                                     
          maturity of investments
                                                                                                    18,714,000 
          adjustments to reconcile net income (loss) to net cash from operating activities:
                                                                                                     
          changes in current assets and current liabilities:
                                                                                                     
          other operating activities
                                                                                                     
          long-term deposit
                                                                                                     
          cash paid for business and technology acquisitions, net of cash acquired
                                                                                                     
          issuance of common stock under stock option and stock purchase plans
                                                                                                     
          net increase in cash and cash equivalents