7Baggers

ADTRAN, Inc
(NASDAQ:ADTN) 

ADTN stock logo

ADTRAN, Inc. provides networking and communications platforms and services for service providers, cable/multiple system operators, small- to medium-sized business, and distributed enterprises in the United States, Germany, Mexico, and internationally. The company operates through two segments, Netwo...

Founded: 1985
Full Time Employees: 1,790
Sector: Technology
Industry: Communication Equipment

Share this website to your friends
• Market Cap:
• Exchange:
• Shs Outstanding:
• Employees:
• Beta:
• Return on Equity (ROE) ttm:
• Return on Assets (ROA) ttm:
• EPS ttm:
• Book value per Share:
• Cash per Share:
• Current ast per Share:
• P/E ttm:
• P/E forward:
• P/E ttm high:
• P/E ttm low:
• P/S ttm:
• P/B ttm:
• P/FCF ttm:
• PEG ratio:
• Cash Ratio ttm:
• Quick Ratio ttm:
• Current Ratio ttm:
• Gross Mgn ttm:
• EBITDA Mgn ttm:
• Operating Mgn ttm:
• Net Income Mgn ttm:
• Trailing Div yield:
• Forward Div yield:
• Payout Ratio ttm:
• Ex-Dividend date:
• Target Price High:
• Target Price Low:
• Target Price Mean:
• Number of Analysts:
• Debt Ratio ttm:
• Debt to Equity ttm:
• Total Net Debt:
At a glance:
Bull Thesis:
Bear Thesis:
Main Competitors:
Moat:
Income Statements:
Quarterly
Annual
    Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-03-31 2013-09-30 2008-12-31 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 
                                                               
      revenue
           356,786,000 368,192,000  345,844,000 263,377,500 368,192,000                                               
      yoy
           35.47% 0.00%                                                   
      qoq
           -3.10%   31.31% -28.47%                                                
      network solutions
    232,543,000 219,498,000        283,002,000    155,992,000 138,374,000 138,809,000 120,767,000 125,449,000 113,809,000 115,229,000 111,323,000 97,372,000 96,219,000 94,018,000 139,167,000                                   
      services & support
    46,892,000 45,570,000        44,376,000    16,046,000 16,144,000 15,349,000 17,314,000 17,783,000 13,724,000 17,914,000 17,392,000 17,151,000 19,568,000 20,074,000 17,224,000                                   
      total revenue
    279,435,000 265,068,000        327,378,000    172,038,000 154,518,000 154,158,000 138,081,000 143,232,000 127,533,000                                         
      cost of revenue
                                                               
      network solutions - charges and inventory write-down
                                                               
      total cost of revenue
    172,309,000 166,144,000        234,825,000    109,532,000 100,202,000 99,723,000 90,408,000 80,564,000 73,932,000                                         
      gross profit
    107,126,000 98,924,000        92,553,000    62,506,000 54,316,000 54,435,000 47,673,000 62,668,000 53,601,000 58,962,000 53,472,000 51,600,000 47,209,000 46,331,000 65,015,000 60,612,000 55,388,000 58,448,000 49,996,000 39,733,000 58,815,000 86,498,000 84,632,000 73,715,000 70,787,000 75,808,000 78,955,000 65,794,000 62,439,000 70,649,000 65,563,000 82,547,000  72,431,000 64,508,000 84,232,000 89,314,000 69,546,000 60,228,000 58,980,000 66,812,000 69,761,000 65,518,000 66,304,406 58,917,338 49,699,859 47,073,396 48,428,431 45,525,189 
      yoy
             48.07%    -0.26% 1.33% -7.68% -10.84% 21.45% 13.54% 27.26% -17.75% -14.87% -14.77% -20.73% 30.04% 52.55% -5.83% -32.43% -40.93% -46.10% -16.91% 14.10% 7.19% 12.04% 13.37% 7.30% 20.43% -20.30%  -2.46% 1.64% -2.00%  4.15% 7.11% 42.81% 33.68% -0.31% -8.07% -11.05% 13.40% 40.36% 39.18% 36.91% 29.42%     
      qoq
    8.29%             15.08% -0.22% 14.18% -23.93% 16.92% -9.09% 10.27% 3.63% 9.30% 1.90% -28.74% 7.26% 9.43% -5.24% 16.91% 25.83% -32.44% -32.00% 2.20% 14.81% 4.14% -6.62% -3.99% 20.00% 5.37% -11.62% 7.76% -20.57%   12.28% -23.42% -5.69% 28.42% 15.47% 2.12% -11.72% -4.23% 6.48% -1.19% 12.54% 18.55% 5.58% -2.80% 6.38%  
      gross margin %
    Infinity% Infinity% NaN% NaN% NaN% NaN% NaN% 0% 0% Infinity% 0% 0% 0% 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% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      selling, general and administrative expenses
    58,234,000 60,347,000        66,583,000    27,873,000 27,893,000 35,141,000 30,972,000 30,866,000 27,435,000 27,205,000 30,799,000 26,620,000 30,625,000 30,912,000 33,619,000 35,132,000 28,079,000 30,750,000 32,080,000 33,531,000 31,387,000 34,652,000 34,683,000 34,767,000 34,438,000 33,716,000 32,866,000 30,785,000 30,339,000 30,016,000 31,064,000 32,794,000  26,444,000 24,766,000 24,154,000 25,011,000 24,297,000 22,949,000 23,477,000 22,195,000 23,984,000 22,270,000 22,112,415 20,623,108 20,346,033 20,152,444 20,463,236 19,587,128 
      research and development expenses
    51,680,000 51,895,000        70,598,000    26,500,000 26,491,000 26,532,000 26,759,000 27,871,000 27,501,000 27,223,000 28,712,000 29,859,000 30,654,000 31,835,000 32,064,000 31,647,000 31,092,000 29,877,000 30,729,000 32,849,000 31,489,000 33,528,000 33,501,000 31,916,000 32,077,000 31,962,000 31,277,000 29,488,000 29,300,000 32,561,000 32,536,000 32,543,000  17,469,000 17,766,000 14,857,000 15,087,000 16,367,000 16,343,000 17,812,000 18,859,000 15,896,000 14,817,000 15,245,204 14,989,448 13,638,856 14,270,491 13,814,756 14,008,528 
      goodwill impairment
                                                               
      operating income
    -2,788,000 -13,318,000        -44,628,000    8,133,000 -68,000 -7,238,000 -10,058,000 3,931,000 -1,335,000 4,534,000 -6,039,000 -4,944,000 -14,070,000 -20,288,000 562,000 -6,167,000 -3,783,000 -2,179,000 -12,813,000 -26,647,000 -4,061,000 18,318,000 16,448,000 7,032,000 4,272,000 10,130,000 14,812,000 5,521,000 2,800,000 8,072,000 1,963,000 17,210,000  28,518,000 21,976,000 45,221,000 49,216,000 28,882,000 20,936,000 17,691,000 25,758,000 29,881,000 28,431,000 28,946,787 23,304,782 15,714,970 12,650,461 14,150,439 11,929,533 
      yoy
             -648.73%    106.89% -94.91% -259.64% 66.55% -179.51% -90.51% -122.35% -1174.56% -19.83% 271.93% 831.07% -104.39% -76.86% -6.85% -111.90% -177.90% -478.94% -195.06% 80.83% 11.05% 27.37% 52.57% 25.50% 654.56% -67.92%  -71.70% -91.07% -61.94%  -1.26% 4.97% 155.62% 91.07% -3.34% -26.36% -38.88% 10.53% 90.14% 124.74% 104.56% 95.35%     
      qoq
    -79.07%             -12060.29% -99.06% -28.04% -355.86% -394.46% -129.44% -175.08% 22.15% -64.86% -30.65% -3709.96% -109.11% 63.02% 73.61% -82.99% -51.92% 556.17% -122.17% 11.37% 133.90% 64.61% -57.83% -31.61% 168.28% 97.18% -65.31% 311.21% -88.59%   29.77% -51.40% -8.12% 70.40% 37.95% 18.34% -31.32% -13.80% 5.10% -1.78% 24.21% 48.30% 24.22% -10.60% 18.62%  
      operating margin %
    -Infinity% -Infinity% NaN% NaN% NaN% NaN% NaN% 0% 0% -Infinity% 0% 0% 0% 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% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      interest and dividend income
    291,000 201,000        358,000    217,000 204,000 1,957,000 344,000 253,000 290,000 344,000 331,000 356,000 872,000 610,000 692,000 591,000 1,422,000 825,000 913,000 866,000 1,523,000 952,000 972,000 933,000 1,226,000 910,000 927,000 855,000 1,273,000 839,000 933,000 1,579,000                  
      interest expense
    -5,499,000 -4,564,000        -4,064,000    -94,000 -30,000 -16,000 -6,000 -6,000 -6,000   -1,000 -129,000 -128,000 -127,000 -127,000 -135,000 -134,000 -132,000 -132,000 -139,000 -139,000 -137,000 -141,000 -142,000 -143,000 -142,000 -145,000 -148,000 -151,000 -148,000 -581,000  -633,000 -634,000 -634,000 -693,000 -625,000 -583,000 -610,000 -644,000 -644,000 -644,000 -582,611 -631,944 -659,722 -659,722 -490,210.5 -645,834 
      net investment gain
    2,186,000 3,075,000        1,262,000    -4,646,000 -3,415,000 -1,181,000 -63,000 2,009,000 996,000 2,844,000 9,852,000 -10,877,000 3,239,000 -216,000 2,485,000 5,926,000 -9,450,000 4,507,000                                
      other income
    -745,000 -2,636,000        2,494,000    681,000 -226,000 1,151,000 648,000 26,000 1,999,000 -1,679,000 -1,757,000 1,129,000 -768,000 1,616,000 -205,000 855,000 1,359,000 201,000  -57,000    51,000 -273,000 -246,000  119,000 -617,000 52,000 -353,000 22,000  510,000 18,000 -881,000 67,000 387,000 368,000 495,000 -33,000 530,000 360,000 -255,339 975,821 504,301 384,216 -6,523,665 2,607,647 
      income before income taxes
    -6,555,000 -17,242,000        -44,578,000    4,291,000 -3,535,000 -5,327,000 -9,135,000 6,213,000 1,944,000 6,043,000 2,387,000 -14,337,000 -10,856,000 -18,406,000                                    
      income tax benefit
    -1,202,000 -1,016,000        8,363,000    -2,148,000 2,408,000 1,137,000 -1,292,000 -1,127,000 -1,048,000 -562,000 -1,635,000 4,368,000 -768,000 -27,717,000                                    
      net income
    -7,757,000 -18,258,000      -15,123,500 -48,084,000 -36,215,000 -73,489,000 51,606,000 -48,084,000 2,143,000 -1,127,000 -4,190,000 -10,427,000 5,086,000 896,000 5,481,000 752,000 -9,969,000 -11,624,000 -46,123,000 3,995,000 770,000 -8,447,000 7,589,000 -7,670,000 -10,814,000 -11,110,000 15,898,000 12,401,000 6,651,000 7,572,000 12,415,000 10,228,000 5,014,000 5,718,000 7,067,000 3,317,000 16,205,000  20,814,000 16,255,000 32,196,000 33,015,000 20,719,000 15,220,000 14,594,000 18,751,000 21,398,000 20,398,000 21,432,086 17,165,159 12,378,860 10,538,895 12,110,234 3,358,467 
      yoy
           -129.31% 0.00% -1789.92% 6420.76% -1331.65% 361.15% -57.86% -225.78% -176.45% -1486.57% -151.02% -107.71% -111.88% -81.18% -1394.68% 37.61% -707.76% -152.09% -107.12% -23.97% -52.26% -161.85% -262.59% -246.72% 28.05% 21.25% 32.65% 32.42% 75.68% 208.35% -69.06%  -66.05% -79.59% -49.67%  0.46% 6.80% 120.61% 76.07% -3.17% -25.38% -31.91% 9.24% 72.86% 93.55% 76.97% 411.10%     
      qoq
    -57.51%       -68.55% 32.77% -50.72% -242.40% -207.32% -2343.77% -290.15% -73.10% -59.82% -305.01% 467.63% -83.65% 628.86% -107.54% -14.24% -74.80% -1254.52% 418.83% -109.12% -211.31% -198.94% -29.07% -2.66% -169.88% 28.20% 86.45% -12.16% -39.01% 21.38% 103.99% -12.31% -19.09% 113.05% -79.53%   28.05% -49.51% -2.48% 59.35% 36.13% 4.29% -22.17% -12.37% 4.90% -4.82% 24.86% 38.67% 17.46% -12.98% 260.59%  
      net income margin %
    -Infinity% -Infinity% NaN% NaN% NaN% NaN% NaN% -4.24% -13.06% -Infinity% -21.25% 19.59% -13.06% 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% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      less: net income attributable to non-controlling interest
    2,505,000 2,273,000                                                          
      net loss attributable to adtran holdings, inc.
    -10,262,000                                                           
      weighted-average shares outstanding – basic
    79,803,000 79,748,000        78,366,000  62,346,000  49,123,000 49,113,000 48,582,000 48,609,000 48,449,000 48,336,000 47,957,000 47,958,000 47,957,000 47,836,000 47,824,000 47,802,000 47,782,000 47,880,000 47,710,000 47,856,000 48,232,000 48,153,000 47,870,000 48,036,000 48,430,000 48,724,000 48,470,000 48,831,000 49,220,000 51,145,000 49,862,000 53,399,000 57,947,000 63,549,000 75,324,000 76,655,000               
      weighted-average shares outstanding – diluted
    79,803,000 79,748,000        78,366,000  62,346,000  49,809,000 49,113,000 48,582,000 48,609,000 49,426,000 49,004,000 48,424,000 48,254,000 47,957,000 47,836,000 47,824,000 48,036,000 47,853,000 47,880,000 47,834,000 47,902,000 48,292,000 48,699,000 48,531,000 48,413,000 48,939,000 48,949,000 48,678,000 49,048,000 49,389,000 51,267,000 49,927,000 53,634,000 58,617,000 64,408,000 77,284,000 78,909,000               
      loss per common share attributable to adtran holdings, inc. – basic
    -120 -240                                                          
      loss per common share attributable to adtran holdings, inc. – diluted
    -120 -240                                                          
      other comprehensive income, net of tax
    -3,700,000 46,723,000                                                          
      defined benefit plan adjustments
    -6,000 268,000                                                          
      foreign currency translation gain
    -3,694,000 46,455,000                                                          
      comprehensive income, net of tax
    -11,457,000 28,465,000                                                          
      less: comprehensive income attributable to non-controlling interest
    2,505,000 2,273,000                                                          
      comprehensive income attributable to adtran holdings, inc., net of tax
    -13,962,000 26,192,000                                                          
      net income attributable to adtran holdings, inc.
     -20,531,000        -33,334,000                                                  
      weighted-average useful life
                                                               
      customer relationships
      52,849,000  54,016,000 52,587,000 52,754,000                                                     
      backlog
      56,242,000  57,905,000 55,868,000 56,106,000                                                     
      developed technology
      372,948,000  332,245,000 320,849,000 322,176,000                                                     
      licensed technology
      5,900,000  5,900,000 5,900,000 5,900,000                                                     
      licensed agreements
      560,000                                                         
      trade names
      29,094,000  29,955,000 28,901,000 29,024,000                                                     
      total
      517,593,000 71,524,500 480,581,000 464,665,000 466,520,000                                                     
      2025
       -38,908,000                                                        
      2026
       -36,858,000                                                        
      2027
       -36,520,000                                                        
      2028
       -37,890,000                                                        
      2029
                                                               
      thereafter
       -82,879,000                                                        
      wells fargo credit agreement
      189,576,000                                                         
      total non-current revolving credit facility
      189,576,000                                                         
      licensing agreements
        560,000 560,000 560,000                                                     
      patents
                                                               
      2024
       3,726,250                                                        
      less: net loss attributable to non-controlling interest
             -2,881,000                                                  
      earnings per common share attributable to adtran holdings, inc. – basic
             -430                                                  
      earnings per common share attributable to adtran holdings, inc. – diluted
             -430                                                  
      earnings per common share – basic
                 40 -20 -90 -210 100 20 110 20 -210 -240 -960 80 20 -170 160 -160 -220 -230 330 260 140 150 260 210 100 110 140 60 280  280 210 420 440 280 200 190 240 270 260 798.95 0.44 0.33 0.28 0.32 0.09 
      earnings per common share – diluted
                 40 -20 -90 -210 100 20 110 20 -210 -240 -960 80 20 -170 160 -160 -220 -230 330 260 140 160 260 210 100 110 140 60 280  270 210 222.5 420 270            
      asset impairments
                         65,000  3,872,000                                    
      sales
                                          139,013,000 158,078,000 142,835,000 177,404,000  122,296,000 108,648,000 140,595,000 149,170,000 118,873,000 104,577,000 104,625,000 115,251,000 120,601,000 114,039,000 113,815,846 106,200,640 90,437,013 86,222,501 88,418,513 88,180,461 
      total sales
                       133,143,000 128,715,000 114,523,000 115,787,000 114,092,000 156,391,000 143,791,000 140,088,000 140,335,000 128,048,000 120,806,000 126,836,000 185,112,000 184,673,000 170,279,000 162,986,000 168,890,000 162,701,000 142,204,000                      
      cost of sales
                                          76,574,000 87,429,000 77,272,000 94,857,000  49,865,000 44,140,000 56,363,000 59,856,000 49,327,000 44,349,000 45,645,000 48,439,000 50,840,000 48,521,000 47,511,440 47,283,302 40,737,154 39,149,105 39,990,082 42,655,272 
      total cost of sales
                       74,181,000 75,243,000 62,923,000 68,578,000 67,761,000 91,376,000 83,179,000 84,700,000 81,887,000 78,052,000 81,073,000 68,021,000 98,614,000 100,041,000 96,564,000 92,199,000 93,082,000 83,746,000 76,410,000                      
      gain on contingency
                            -1,230,000                                   
      gain on bargain purchase of a business
                                 11,322,000     -8,000 3,550,000                        
      income before benefit for income taxes
                            3,407,000                             14,628,858 25,708,460   4,037,855.75 3,336,025 
      benefit for income taxes
                            588,000 -308,000 2,140,000 4,369,000 3,589,000 3,931,000                        -4,608,129.5 -8,543,301   -871,423.75 22,442 
      products
                             125,822,000 116,873,000 121,043,000 115,063,000 105,253,000 95,789,000 145,467,000 155,543,000 143,597,000 126,793,000 136,277,000 138,549,000 123,883,000                      
      services
                             17,969,000 23,215,000 19,292,000 12,985,000 15,553,000 31,047,000 39,645,000 29,130,000 26,682,000 36,193,000 32,613,000 24,152,000 18,321,000                      
      income before provision for income taxes
                             1,078,000 -5,696,000 3,220,000 -11,259,000 -14,745,000 -734,000 19,207,000 17,869,000 8,345,000 6,844,000 15,517,000 16,456,000 8,078,000 5,215,000 10,872,000 5,510,000 19,981,000  32,282,000 25,458,000 47,291,000 51,630,000 31,252,000 23,201,000 20,845,000 27,251,000 31,700,000 30,219,000   17,962,311 14,844,661   
      dividend per share
                             0.09 0.068 0.09 0.09 0.09 0.068 0.09 0.09 0.09 0.068 0.09 0.09 0.09 0.068 0.09 0.09 0.09  0.09 0.09         0.538 2.15     
      net realized investment gain
                                990,000 -97,000 1,816,000 1,009,000 1,390,000 470,000 1,769,000 1,316,000 1,110,000 1,728,000 1,907,000 2,060,000 3,115,000 1,751,000  474,000 600,000 318,750 535,000 259,000 481,000 147,500 646,000 71,000 -126,000 56,613  224,675    
      other expense
                                -217,000  127,000 -933,000 -804,000    -251,000                       
      provision for income taxes
                                  -10,376,000 -3,309,000 -5,468,000 -1,694,000 728,000 -3,102,000 -6,228,000 -3,064,000 503,000 -3,805,000 -2,193,000 -3,776,000  -11,468,000 -9,203,000 89,353,000 -18,615,000 -10,533,000 -7,981,000 63,499,000 -8,500,000 -10,302,000 -9,821,000   -5,583,451 -4,305,766   
      interest income
                                               3,413,000 3,498,000 1,713,250 2,505,000 2,349,000 1,999,000 1,396,250 1,524,000 1,862,000 2,198,000 1,676,454.25 2,059,801 2,178,087 2,467,929   
      weighted-average shares outstanding - basic
                                                  75,710,000 75,341,000            
      weighted-average shares outstanding - diluted
                                                  78,213,000 77,495,000            
      dividends per share
                                                 0.063 0.09 0.08 0.08 0.06 0.08 0.08 0.08       
      weighted-average shares outstanding
                                                 75,775,000   75,755,000 78,235,000 77,778,000 79,313,000 79,500,000 76,942,000 38,718,414 38,018,429 37,594,815 38,045,128 37,644,721 
      weighted-average shares outstanding assuming dilution
                                                 77,966,000   77,318,000 80,985,000 80,437,000 82,221,000 82,792,000 80,739,000 40,719,899 39,949,456 38,961,790 38,221,750 37,670,734 
      earnings per common share – assuming dilution
                                                    200 190 230 260 250 759 0.42 0.31 0.27 0.32 0.09 
      net realized investment gains
                                                            1,777   
      net realized investment loss
                                                             -2,979,633.75 -10,555,321 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-03-31 2013-09-30 2008-12-31 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 
                                                                   
        assets
                                                                   
        current assets
                                                                   
        cash and cash equivalents
      88,270,000 95,696,000 93,682,000 106,271,000 101,321,000 77,567,000 88,456,000 111,185,000 106,757,000 87,167,000 116,092,000 124,294,000 136,457,000 108,644,000 111,099,000 43,368,000 53,979,000 56,603,000 75,503,000 69,927,000 63,777,000 71,081,000 69,059,000 71,285,000 73,773,000 96,407,000 106,817,000 109,119,000 105,504,000 94,173,000 100,319,000 82,623,000 86,433,000 128,253,000 88,798,000 72,558,000 79,895,000 66,292,000 70,914,000 91,609,000 84,550,000 83,687,000 87,009,000 54,311,000 41,909,000 34,668,000 110,160,000 112,794,000 70,585,000 53,433,000 48,892,000 57,602,000 144,239,000 230,904,000 171,166,000 132,072,000 74,922,049 126,645,119 138,678,211 125,092,393 84,917,178 
        accounts receivables
      215,473,000 210,687,000 178,621,000 164,768,000 166,519,000 178,030,000 172,025,000 186,176,000 187,554,000 216,445,000 229,333,000 239,565,000 262,043,000 279,435,000 302,401,000 172,088,000 150,111,000 158,742,000 124,146,000 122,669,000 103,201,000 100,223,000 95,335,000 86,465,000 90,531,000 90,647,000 116,661,000 99,032,000 99,385,000 101,865,000 76,135,000 80,883,000 144,150,000 101,613,000 79,891,000 85,396,000 92,346,000 101,822,000 89,386,000 67,492,000 71,917,000 86,176,000 90,869,000 108,018,000 52,749,000 64,687,000 62,555,000 66,246,000 71,554,000 64,119,000 64,883,000 63,729,000 64,374,000 69,657,000 66,718,000 52,384,000 53,854,717 50,986,080 49,232,055 38,882,390 45,687,493 
        other receivables
      10,292,000 7,046,000 8,709,000 8,354,000 9,613,000 9,775,000 12,871,000 11,436,000 12,116,000 17,450,000 24,337,000 32,394,000 30,938,000 32,831,000 14,350,000 8,413,000 17,373,000 11,228,000 9,867,000 20,187,000 22,669,000 22,899,000 26,026,000 23,121,000 16,566,000 18,927,000 24,984,000 34,583,000 36,699,000 30,084,000 28,163,000 35,124,000 26,578,000 18,541,000 14,561,000 13,398,000 15,137,000 12,159,000 11,676,000 9,199,000 19,321,000 20,858,000 29,962,000 20,268,000 2,896,000 4,694,000 3,066,000 3,214,000 7,260,000 7,985,000 4,571,000 4,335,000 4,655,000 7,273,000 5,044,000 6,988,000 7,568,533 2,921,778 4,252,322 4,459,734 9,407,733 
        inventory
      209,003,000 215,736,000 223,755,000 240,081,000 253,639,000 269,337,000 282,926,000 287,860,000 322,147,000 362,295,000 373,971,000 416,802,000 416,291,000 427,531,000 416,163,000 196,916,000 171,121,000 139,891,000 127,241,000 119,012,000 122,862,000 120,260,000 106,131,000 99,515,000 98,305,000 104,941,000 95,110,000 93,609,000 99,848,000 106,060,000 120,537,000 120,021,000 122,542,000 116,230,000 113,995,000 112,774,000 105,117,000 96,034,000 86,936,000 92,107,000 91,533,000 100,705,000 93,123,000 92,972,000 47,406,000 47,201,000 48,160,000 50,266,000 53,629,000 46,738,000 40,426,000 42,316,000 43,629,000 43,649,000 44,380,000 39,975,000 38,281,261 39,313,898 37,381,944 39,926,384 41,446,326 
        income tax receivable
      2,971,000 3,667,000 6,478,000 8,136,000 6,632,000 5,461,000 13,466,000 13,050,000 8,717,000 7,933,000                           760,000 540,000 2,405,000             2,442,000 2,679,000   11,586,000      
        prepaid expenses and other current assets
      62,492,000 55,317,000 72,424,000 67,717,000 62,222,000 58,534,000 69,112,000 58,612,000 59,667,000 45,566,000 35,826,000 33,880,000 37,021,000 33,577,000 30,739,000 9,306,000 9,076,000 9,296,000 10,061,000 9,830,000 7,625,000 8,374,000 8,104,000 7,419,000 7,892,000 10,327,000 8,909,000 9,683,000 10,744,000 10,428,000 9,464,000 9,693,000 17,282,000 23,127,000 23,556,000 17,816,000 16,459,000 14,477,000 13,563,000 13,096,000 10,145,000                     
        short-term investments - deferred compensation
      33,813,000 35,174,000                                                            
        assets held for sale
      11,901,000 11,901,000 11,901,000 11,901,000 11,901,000 11,901,000                                                        
        total current assets
      634,215,000 635,224,000 603,117,000 607,228,000 611,847,000 610,605,000 638,856,000 668,319,000 696,958,000 736,856,000 779,559,000 850,024,000 883,808,000 882,358,000 875,555,000 431,864,000 402,141,000 376,325,000 349,530,000 344,497,000 324,345,000 329,339,000 314,874,000 293,789,000 320,310,000 350,003,000 383,369,000 377,316,000 355,426,000 348,522,000 340,687,000 344,746,000 413,114,000 419,149,000 368,132,000 354,400,000 352,902,000 364,803,000 344,235,000 320,773,000 330,786,000 356,959,000 401,112,000 430,396,000 252,864,000 320,635,000 392,626,000 395,354,000 393,268,000 328,547,000 300,254,000 302,386,000 292,042,000 373,911,000 315,135,000 260,378,000 198,414,751 247,674,481 275,524,436 235,556,535 229,940,419 
        property, plant and equipment
      123,849,000 124,384,000 121,465,000 111,936,000 109,609,000 102,942,000 147,428,000 134,578,000 126,969,000 123,020,000 118,623,000 115,719,000 111,969,000 110,699,000 104,577,000 53,432,000 54,384,000 55,766,000 56,556,000 58,270,000 60,157,000 64,353,000 65,194,000 66,500,000 73,708,000 73,384,000 78,813,000 79,505,000 80,635,000 81,457,000 82,910,000 83,875,000 85,079,000 85,665,000 84,122,000 83,514,000 84,469,000 78,078,000 74,115,000 73,511,000 73,233,000 73,656,000 73,987,000 77,658,000 75,487,000 83,078,000 83,716,000 85,033,000 86,532,000 87,730,000 88,317,000 89,361,000 91,603,000 93,053,000 95,058,000 97,667,000 99,001,756 100,830,329 103,252,712 106,173,833 109,433,764 
        goodwill
      59,003,000 59,983,000 59,919,000 60,194,000 55,261,000 52,918,000 56,884,000 54,897,000 55,129,000 353,415,000 339,083,000 388,163,000 385,755,000 381,724,000 357,869,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,968,000 6,982,000 7,106,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000 3,492,000                  
        intangible assets
      281,280,000  302,281,000 310,169,000                                                          
        deferred tax assets
      16,223,000 16,481,000 17,826,000 17,826,000 17,826,000 17,826,000 25,697,000 24,931,000 25,421,000 25,787,000 90,260,000 82,076,000 81,631,000 6,210,000  8,508,000 8,939,000 9,079,000 8,957,000 9,165,000 9,448,000 7,865,000 7,573,000 7,447,000 7,561,000 6,492,000 39,033,000 36,891,000 37,187,000 39,595,000 35,615,000 21,427,000 23,428,000 37,130,000 40,296,000 39,085,000 38,036,000 17,963,000 18,488,000 17,967,000 18,924,000 17,517,000 16,297,000 13,494,000 8,653,000 6,321,000 6,251,000 5,960,000 6,091,000 4,311,000 4,191,000 4,488,000 4,183,000 4,718,000 3,288,000 3,381,000 5,023,367 4,117,989 4,117,989 4,799,390 4,043,832 
        other non-current assets
      69,560,000 73,352,000 69,021,000 75,826,000 75,659,000 78,128,000 86,677,000 87,105,000 87,729,000 87,706,000 60,770,000 60,634,000 63,152,000 66,998,000 56,347,000 29,637,000 30,542,000 30,971,000   26,195,000                                         
        long-term investments
      937,000 1,022,000 35,279,000 33,116,000 29,973,000 32,060,000 31,506,000 30,159,000 29,252,000 27,743,000 25,179,000 31,238,000 32,994,000 32,665,000 50,131,000 52,297,000 67,713,000 70,615,000 83,935,000 82,778,000 81,266,000 78,016,000 84,383,000 79,136,000 94,489,000 90,632,000 87,280,000 85,227,000 108,822,000 144,241,000 144,437,000 156,472,000 130,256,000 136,987,000 159,634,000 174,413,000 176,102,000 178,379,000 186,249,000 195,683,000 198,026,000 204,513,000 236,678,000 298,122,000 141,241,000 190,299,000 185,132,000 170,836,000 148,620,000 157,730,000 161,022,000 167,609,000 173,058,000 144,269,000 210,984,000 233,734,000 238,845,301 216,525,118 158,864,919 176,330,988 172,126,523 
        total assets
      1,185,067,000 1,204,493,000 1,208,908,000 1,216,295,000 1,193,239,000 1,179,372,000 1,273,146,000 1,290,782,000 1,327,906,000 1,682,512,000 1,742,169,000 1,882,938,000 1,938,595,000 1,881,865,000 1,838,054,000 600,179,000 589,092,000 569,017,000 557,912,000 551,426,000 530,763,000 531,415,000 522,672,000 498,270,000 545,118,000 579,875,000 639,786,000 632,623,000 628,027,000 648,830,000 639,570,000 642,647,000 669,094,000 695,558,000 668,981,000 667,178,000 667,235,000 655,563,000 636,558,000 621,494,000 632,904,000 671,854,000 744,180,000 832,984,000 473,615,000 594,511,000 661,972,000 652,618,000 629,766,000 574,590,000 550,177,000 559,942,000 557,235,000 611,729,000 624,250,000 593,900,000 537,493,025 568,879,680 542,963,391 521,212,820  
        liabilities and equity
                                                                   
        current liabilities
                                                                   
        accounts payable
      170,605,000 167,337,000 188,947,000 178,287,000 171,912,000 170,451,000 173,354,000 158,550,000 159,083,000 162,922,000 148,913,000 171,735,000 198,596,000 237,699,000 276,026,000 144,432,000 127,111,000 102,489,000 79,074,000 66,499,000 55,476,000 59,886,000 62,465,000 47,685,000 44,870,000 52,842,000 63,827,000 60,116,000 61,054,000 65,032,000 60,150,000 50,653,000 60,632,000 73,127,000 66,161,000 74,300,000 77,342,000 67,399,000 59,211,000 42,635,000 48,668,000 69,372,000 73,696,000 73,672,000 20,313,000 26,997,000 19,334,000 25,682,000 36,224,000 31,030,000 22,226,000 22,856,000 23,222,000 26,024,000 25,453,000 24,821,000 25,584,986 19,542,071 19,949,460 17,788,964 25,952,964 
        unearned revenue
      90,752,000 87,541,000 57,563,000 62,695,000 66,459,000 52,701,000 54,615,000 55,107,000 55,124,000 46,731,000 49,832,000 48,030,000 55,611,000 41,193,000 40,993,000 22,705,000 19,454,000 17,737,000 16,394,000 15,889,000 14,457,000 13,379,000 12,090,000 12,465,000 11,963,000 14,022,000 12,910,000 15,230,000 17,940,000 17,004,000 14,307,000 13,948,000 13,070,000 13,651,000 15,449,000 16,969,000 16,326,000 15,744,000 15,982,000 18,683,000 16,615,000 16,484,000 16,815,000 19,658,000 6,141,000 4,386,000 4,653,000 4,318,000 3,728,000 3,118,000 2,248,000 2,468,000 2,354,000 2,597,000 2,993,000 3,209,000      
        accrued expenses and other liabilities
      31,736,000 33,690,000 30,544,000 38,127,000 38,161,000 35,704,000 34,482,000 36,307,000 36,404,000 37,607,000 29,708,000 26,807,000 27,424,000 35,235,000 25,554,000 16,759,000 18,736,000 13,673,000 15,392,000 15,655,000 14,601,000 13,173,000 12,466,000 12,748,000                                      
        accrued wages and benefits
      23,449,000 32,203,000 29,245,000 29,532,000 25,910,000 32,853,000 40,366,000 37,520,000 25,869,000 27,030,000 35,957,000 36,843,000 30,333,000 44,882,000 41,595,000 13,276,000 13,953,000 14,900,000 17,270,000 15,681,000 15,856,000 17,228,000 17,683,000 13,247,000 13,890,000 16,569,000 19,126,000 15,105,000 14,752,000 12,604,000 14,913,000 15,863,000 15,948,000 15,345,000 16,303,000 12,199,000 20,433,000 16,468,000 15,702,000 11,064,000 12,857,000 14,842,000 15,605,000 16,594,000 9,868,000                 
        deferred compensation liability
      37,051,000 37,447,000 36,684,000 34,390,000 31,283,000 33,203,000 32,046,000 30,601,000 29,709,000 29,039,000 26,833,000 28,522,000 28,674,000 26,668,000 25,376,000 26,014,000 29,691,000 31,383,000 28,336,000 28,769,000 26,658,000 22,957,000 21,908,000 18,321,000 21,698,000                                     
        income tax payable
      5,613,000 3,642,000 1,453,000 1,019,000 999,000 1,936,000 2,007,000 2,228,000 6,266,000 5,221,000 10,302,000 15,314,000 19,397,000 9,032,000 26,838,000 4,541,000 3,519,000 6,560,000 5,914,000 2,345,000 1,765,000 3,346,000 2,450,000 3,273,000 3,512,000 3,420,000 9,571,000 11,785,000 12,518,000 14,340,000 11,948,000 8,277,000 3,936,000 7,696,000 9,594,000 3,126,000    2,739,000 2,395,000 12,923,000 13,088,000 548,000 266,000 4,360,000 11,597,000 4,551,000 11,126,000 1,616,000 6,335,000   2,423,000 10,229,000       
        total current liabilities
      359,206,000 361,860,000 307,752,000 309,660,000 303,441,000 293,645,000 304,824,000 289,712,000 282,746,000 279,511,000 285,292,000 309,641,000 522,204,000 488,575,000 525,291,000 201,713,000 182,773,000 155,359,000 134,044,000 116,069,000 102,155,000 107,012,000 107,154,000 89,418,000 112,711,000 128,150,000 145,365,000 141,875,000 118,010,000 123,528,000 116,103,000 102,567,000 106,818,000 124,918,000 120,940,000 121,629,000 126,535,000 115,621,000 103,021,000 88,634,000 92,643,000 127,048,000 131,977,000 126,999,000 40,124,000 49,947,000 47,114,000 51,049,000 63,138,000 47,359,000 39,494,000 36,015,000 35,255,000 41,864,000 50,338,000 40,309,000 38,251,107 31,198,242 36,870,541 32,045,464 44,527,231 
        non-current revolving credit agreement
      25,000,000  25,023,000 190,180,000                                                          
        non-current convertible senior notes, net of debt issuance costs
      193,425,000 193,038,000 192,859,000                                                           
        deferred tax liabilities
      26,776,000 27,453,000 32,299,000 32,866,000 30,735,000 30,690,000 21,483,000 21,077,000 15,414,000 35,655,000 37,977,000 44,614,000 51,850,000  36,884,000                               1,576,000 3,615,000 5,330,000 3,978,000 3,692,000 3,770,000 4,825,000 1,052,000 2,980,000 7,397,000 8,882,000 6,503,571 6,122,516 5,145,552 3,955,229  
        non-current unearned revenue
      26,227,000 27,143,000 23,196,000 24,429,000 24,082,000 22,065,000 24,901,000 26,584,000 22,884,000 25,109,000 23,501,000 24,111,000 24,907,000 19,239,000 18,269,000 10,133,000 9,381,000 9,271,000 7,426,000 7,030,000 7,040,000 6,694,000 6,166,000 4,476,000 6,012,000 4,581,000 4,265,000 4,514,000 5,296,000 3,846,000 3,639,000 4,154,000 4,556,000 4,918,000 5,351,000 5,675,000 6,333,000 7,105,000 6,437,000 7,288,000 7,965,000 8,685,000 10,088,000 26,373,000                  
        non-current pension liability
      6,305,000 6,277,000 9,725,000 9,686,000 8,886,000 8,983,000 12,149,000 11,505,000 11,692,000 12,543,000                                                    
        non-current lease obligations
      24,940,000 27,000,000 25,950,000 27,783,000 26,369,000 25,925,000 25,635,000 26,613,000 27,668,000 31,420,000 23,612,000 20,834,000 21,446,000 22,807,000 21,490,000                                               
        other non-current liabilities
      16,646,000 17,564,000 11,749,000 15,599,000 16,531,000 17,928,000 26,489,000 34,445,000 35,375,000 28,657,000 17,408,000 16,401,000 15,986,000 10,339,000 9,697,000 3,893,000 4,264,000 4,500,000 7,365,000 6,477,000 6,956,000 8,877,000 7,601,000 6,794,000 8,385,000 52,189,000 44,181,000 42,687,000 33,842,000 32,255,000 34,601,000 34,590,000 34,209,000 34,756,000 32,527,000 30,861,000 28,050,000 26,740,000 25,476,000 25,283,000 24,236,000 29,680,000 30,646,000 20,459,000 9,422,000 4,567,000 4,671,000 4,068,000 5,161,000 2,766,000 2,674,000 2,465,000 1,285,000 1,544,000 1,303,000 888,000      
        total liabilities
      678,525,000 685,335,000 665,237,000 644,593,000 631,412,000 622,015,000 637,376,000 630,810,000 620,488,000 636,934,000 625,355,000 655,006,000 675,765,000 578,252,000 653,227,000 251,642,000 236,776,000 211,915,000 194,159,000 175,911,000 160,388,000 161,822,000 158,478,000 134,555,000 164,692,000 184,920,000 193,811,000 189,076,000 181,748,000 185,229,000 179,943,000 166,911,000 171,183,000 191,392,000 185,618,000 184,965,000 187,718,000 177,366,000 162,834,000 149,105,000 152,744,000 194,213,000 201,511,000 220,331,000 97,796,000 106,090,000 105,400,000 110,447,000 122,277,000 103,817,000 95,938,000 93,305,000 87,592,000 96,388,000 109,038,000 100,079,000 94,754,678 87,320,758 92,016,093 86,000,693 98,523,001 
        commitments and contingencies
                                                                   
        redeemable non-controlling interest
      369,017,000 373,328,000 402,088,000 402,089,000 422,934,000 422,943,000 421,776,000 439,743,000 441,635,000 451,756,000 431,921,000 445,462,000 442,668,000                                                 
        equity
                                                                   
        common stock, par value 0.01 per share...
      808,000 802,000 801,000 800,000 800,000 795,000 792,000 791,000 791,000 790,000 787,000 787,000 787,000 781,000 776,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 797,000 796,000 796,000 796,000 793,000 394,452 394,452 394,452   
        additional paid-in capital
      803,031,000 801,269,000 799,949,000 814,749,000 812,071,000 808,913,000 806,187,000 802,737,000 798,897,000 795,304,000 770,565,000 766,428,000 762,035,000 895,834,000 883,210,000 292,727,000 290,839,000 288,946,000 286,923,000 285,081,000 283,273,000 279,688,000 278,078,000 276,423,000 274,632,000 272,854,000 270,983,000 269,529,000 267,670,000 265,757,000 264,118,000 262,333,000 260,515,000 258,655,000 256,821,000 254,965,000 252,957,000 251,217,000 249,851,000 248,305,000 246,879,000 246,577,000 243,476,000 231,146,000 172,704,000   135,582,000 138,264,000 141,130,000 141,944,000 142,243,000 142,565,000 142,764,000 141,919,000 135,814,000 110,310,511 99,850,159 97,334,804 96,982,075 96,289,534 
        accumulated other comprehensive income
      70,046,000 78,877,000 74,655,000 78,355,000 31,632,000 10,897,000 47,377,000 28,274,000 29,656,000 47,461,000 32,800,000 62,208,000 55,251,000 46,713,000                              8,990,000 -1,009,000 1,248,000 3,459,000 4,172,000 4,788,000 4,290,000 4,203,000 5,235,000 6,731,000 7,860,000 11,261,000 10,012,000 7,764,206 5,255,340 1,803,071 3,096,669 1,304,763 
        retained deficit
      -731,345,000 -730,010,000 -728,714,000 -719,183,000 -700,502,000 -680,993,000 -635,164,000 -606,375,000 -558,363,000                                                     
        less treasury stock at cost: 257 and 262 shares as of march 31, 2026 and december 31, 2025, respectively
      -5,015,000                                                             
        total equity
      137,525,000 145,830,000 141,583,000 169,613,000 138,893,000 134,414,000 213,994,000 220,229,000 265,783,000 593,822,000 684,893,000 782,470,000 820,162,000 1,303,613,000 1,184,827,000                                               
        total liabilities and equity
      1,185,067,000 1,204,493,000 1,208,908,000 1,216,295,000 1,193,239,000 1,179,372,000    1,682,512,000    1,881,865,000 1,838,054,000                                               
        intangibles
       294,047,000   293,064,000 284,893,000 286,098,000 290,793,000 306,448,000 327,985,000 328,695,000 355,084,000 379,286,000 401,211,000 393,575,000 17,473,000 18,405,000 19,293,000 20,291,000 21,354,000 22,384,000 24,465,000 25,455,000 26,472,000 27,821,000 29,113,000 30,503,000 31,817,000 33,183,000                                 
        non-current revolving credit agreement outstanding
       25,000,000   190,085,000 189,576,000 189,849,000 190,273,000 195,000,000 195,000,000 200,000,000 200,000,000                                                  
        non-current deferred compensation liability
                                                                   
        less treasury stock at cost: 262 and 266 shares as of december 31, 2025 and 2024, respectively
       -5,108,000                                                            
        restricted cash
        7,547,000              52,000 215,000 102,000 54,000 119,000 322,000 1,186,000                                       
        less treasury stock at cost: 262 and 266 shares as of september 30, 2025 and december 31, 2024, respectively
        -5,108,000                                                           
        less treasury stock at cost: 262 and 266 shares as of june 30, 2025 and december 31, 2024, respectively
         -5,108,000                                                          
        less treasury stock at cost: 262 and 266 shares as of march 31, 2025 and december 31, 2024, respectively
          -5,108,000                                                         
        less treasury stock at cost: 266 and 297 shares as of december 31, 2024 and 2023, respectively
           -5,198,000                                                        
        liabilities, redeemable non-controlling interest and equity
                                                                   
        treasury stock
            -5,198,000 -5,198,000 -5,198,000  -5,970,000 -5,943,000 -5,917,000  -4,083,000 -660,112,000 -660,013,000  -669,899,000 -673,277,000 -676,221,000 -686,508,000 -686,555,000 -686,545,000  -689,973,000                                    
        total liabilities, redeemable non-controlling interest and equity
            1,273,146,000 1,290,782,000 1,327,906,000  1,742,169,000 1,882,938,000 1,938,595,000                                                 
        short-term investments
                 3,089,000 1,058,000 340,000 803,000 1,773,000 429,000 350,000 2,610,000 2,818,000 4,092,000 6,180,000 9,033,000 5,984,000 33,243,000 28,754,000 30,888,000 31,290,000 3,246,000 5,912,000 6,069,000 16,402,000 16,129,000 31,385,000 47,331,000 52,458,000 43,188,000 55,516,000 50,867,000 29,303,000 34,396,000 42,081,000 78,760,000 136,640,000 96,277,000 159,605,000 160,031,000 154,080,000 180,758,000 147,979,000 134,110,000 124,831,000 25,036,000 15,037,000 21,550,000 11,865,000 16,702,697 21,582,788 39,566,321 19,747,205 39,769,165 
        revolving credit agreement outstanding
                                                                   
        notes payable
                   24,598,000 29,782,000                                               
        retained (deficit) earnings
               -243,908,000 -113,289,000 -41,010,000                                                  
        less treasury stock at cost: 297 and 198 shares as of december 31, 2023 and 2022, respectively
               -5,825,000                                                    
        non-controlling interest
                   309,072,000 313,677,000                                               
        revolving credit agreements outstanding
                10,580,000 10,912,000 190,843,000 95,936,000 84,503,000                                               
        pension liability
                10,732,000 10,883,000 10,698,000 10,624,000 16,220,000 9,889,000 10,667,000 11,402,000 16,988,000 17,566,000 17,579,000 16,282,000 15,649,000 15,546,000 15,886,000                                     
        retained earnings
                  8,006,000 55,338,000 31,535,000 731,821,000 734,249,000 740,820,000 760,398,000 776,054,000 776,121,000 788,294,000 787,220,000 790,849,000 806,702,000 827,783,000 878,630,000 879,180,000 883,975,000 900,324,000 897,586,000 909,611,000 922,178,000 941,845,000 931,044,000 923,116,000 921,942,000 920,395,000 912,536,000 906,820,000 906,772,000 905,928,000 905,884,000 878,384,000 603,600,000 495,848,000 481,915,000 472,558,000 447,219,000 421,027,000 406,334,000 397,228,000 388,784,000 376,292,000 361,236,000 347,202,000 332,101,218 397,927,648 385,548,788 375,009,894 362,899,660 
        less treasury stock at cost: 198 and 30,590 shares as of december 31, 2022 and 2021, respectively
                   -4,125,000                                                
        accumulated other comprehensive loss
                    -40,288,000 -16,696,000 -13,556,000 -11,914,000 -14,466,000 -13,140,000 -13,595,000 -12,678,000 -15,346,000 -17,809,000 -16,417,000 -16,506,000 -14,095,000 -14,885,000 -14,416,000 -9,564,000 -9,118,000 -5,803,000 -3,295,000 -4,256,000 -6,816,000 -9,477,000 -12,188,000 -7,826,000 -8,695,000 -7,951,000 -8,969,000 -10,238,000 -3,828,000                   
        liabilities and stockholders' equity
                                                                   
        stockholders' equity
                                                                   
        total stockholders' equity
                     348,537,000 352,316,000 357,102,000       380,426,000    446,279,000    497,911,000    479,517,000                         
        total liabilities and stockholders' equity
                     600,179,000 589,092,000 569,017,000       545,118,000    628,027,000    669,094,000    667,235,000                         
        less treasury stock at cost: 30,590 and 31,280 shares as of december 31, 2021 and 2020, respectively
                       -661,547,000                                            
        other assets
                        31,675,000 28,394,000  20,409,000 18,225,000 17,958,000 14,261,000 23,283,000 13,820,000 14,885,000 5,668,000 31,523,000 32,429,000 32,635,000 13,725,000 13,135,000 13,305,000 12,274,000 12,234,000 13,548,000 9,340,000 9,157,000 9,276,000 9,893,000 10,080,000 11,711,000 103,000 499,000 498,000 497,000 1,346,000 583,000 584,000 586,000 532,000 496,000 493,000 493,000 490,873 487,603 485,775 469,000 469,000 
        liabilities and stockholders’ equity
                                                                   
        stockholders’ equity
                                                                   
        total stockholders’ equity
                        363,753,000 375,515,000 370,375,000 369,593,000 364,194,000 363,715,000  394,955,000 445,975,000 443,547,000  463,601,000 459,627,000 475,736,000  504,166,000 483,363,000 482,213,000  478,197,000 473,724,000 472,389,000 480,160,000 477,641,000 542,669,000 612,653,000 375,819,000 488,421,000 556,572,000 542,171,000 507,489,000 470,773,000 454,239,000 466,637,000 469,643,000 515,341,000 515,212,000 493,821,000 442,738,347 481,558,922 450,947,298 435,212,127 417,490,537 
        total liabilities and stockholders’ equity
                        557,912,000 551,426,000 530,763,000 531,415,000 522,672,000 498,270,000  579,875,000 639,786,000 632,623,000  648,830,000 639,570,000 642,647,000  695,558,000 668,981,000 667,178,000  655,563,000 636,558,000 621,494,000 632,904,000 671,854,000 744,180,000 832,984,000 473,615,000 594,511,000 661,972,000 652,618,000 629,766,000 574,590,000 550,177,000 559,942,000 557,235,000 611,729,000 624,250,000 593,900,000 537,493,025 568,879,680 542,963,391 521,212,820  
        bonds payable
                              24,600,000 25,600,000 25,600,000 25,600,000 24,600,000 25,600,000 25,600,000 25,600,000 25,600,000 26,800,000 26,800,000 26,800,000 26,800,000 27,900,000 27,900,000 27,900,000 27,900,000 28,800,000 28,800,000 46,500,000 48,250,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 50,000,000 
        accrued expenses and other current liabilities
                              13,876,000                                     
        less treasury stock at cost: 31,638 and 31,901 shares as of december 31, 2019 and 2018, respectively
                              -685,288,000                                     
        accrued expenses
                               15,697,000 14,331,000 14,039,000 11,746,000 14,548,000 14,785,000 13,826,000 13,232,000 15,099,000 13,433,000 15,035,000 12,434,000 16,010,000 12,126,000 13,513,000 12,108,000 13,427,000 12,773,000 16,527,000 3,536,000 4,721,000 4,548,000 4,820,000 3,884,000 3,026,000 2,850,000 2,344,000 3,492,000 3,367,000 3,104,000 2,476,000 12,459,118 9,359,295 10,788,459 8,449,617 9,927,059 
        less treasury stock at cost: 31,841 and 31,901 shares at june 30, 2019 and december 31, 2018, respectively
                                -690,340,000                                   
        less treasury stock at cost: 31,875 and 31,901 shares at march 31, 2019 and december 31, 2018, respectively
                                 -691,074,000                                  
        less treasury stock at cost: 31,901 and 31,167 shares at december 31, 2018 and 2017, respectively
                                  -691,747,000                                 
        less treasury stock at cost: 31,941 and 31,167 shares at september 30, 2018 and december 31, 2017, respectively
                                   -693,713,000                                
        less treasury stock at cost: 31,919 and 31,167 shares at june 30, 2018 and december 31, 2017, respectively
                                    -693,756,000                               
        less treasury stock at cost: 31,738 and 31,167 shares at march 31, 2018 and december 31, 2017, respectively
                                     -691,202,000                              
        less treasury stock at cost: 31,167 and 31,180 shares at december 31, 2017 and 2016, respectively
                                      -682,284,000                             
        less treasury stock at cost: 31,649 and 31,180 shares at september 30, 2017 and december 31, 2016, respectively
                                       -692,875,000                            
        less treasury stock at cost: 31,905 and 31,180 shares at june 30, 2017 and december 31, 2016, respectively
                                        -698,483,000                           
        less treasury stock at cost: 31,331 and 31,180 shares at march 31, 2017 and december 31, 2016, respectively
                                         -687,188,000                          
        less treasury stock at cost: 31,180 and 30,094 shares at december 31, 2016 and 2015, respectively
                                          -683,991,000                         
        less treasury stock at cost: 31,260 and 30,094 shares at september 30, 2016 and december 31, 2015, respectively
                                           -686,386,000                        
        less treasury stock at cost: 30,940 and 30,094 shares at june 30, 2016 and december 31, 2015, respectively
                                            -680,765,000                       
        less treasury stock at cost: 30,659 and 30,094 shares at march 31, 2016 and december 31, 2015, respectively
                                             -675,582,000                      
        less treasury stock at cost: 30,094 and 26,221 shares at december 31, 2015 and 2014, respectively
                                              -665,319,000                     
        prepaid expenses
                                               5,935,000 5,092,000 4,693,000 2,974,000 3,459,000 2,403,000 2,794,000 3,391,000 3,982,000 3,181,000 2,643,000 3,247,000 2,673,000 2,989,000 2,127,000 2,062,127 2,106,829 2,295,594 2,649,039 2,807,769 
        less treasury stock at cost: 30,092 and 26,221 shares at september 30, 2015 and december 31, 2014, respectively
                                               -665,423,000                    
        less treasury stock at cost: 26,333 and 26,221 shares at march 31, 2015 and december 31, 2014, respectively
                                                -603,660,000                   
        less treasury stock at cost: 21,965 and 17,342 shares at september 30, 2013 and december 31, 2012, respectively
                                                 -506,664,000                  
        less treasury stock at cost: 17,493 shares at december 31, 2008 and 14,739 shares at december 31, 2007
                                                  -400,273,000                 
        accrued payroll
                                                   9,483,000 6,982,000 11,678,000 8,176,000 8,569,000 5,835,000 8,347,000 6,187,000 7,453,000 8,559,000 9,658,000      
        additional paid in capital
                                                   138,287,000 136,638,000               
        less treasury stock at cost: 6,209 shares at june 30, 2006 and 3,116 shares at december 31, 2005
                                                   -147,759,000                
        less treasury stock at cost: 2,927 shares at march 31, 2006 and 3,116 shares at december 31, 2005
                                                    -66,237,000               
        less treasury stock at cost: 3,116 shares at december 31, 2005 and 3,238 shares at december 31, 2004
                                                     -70,938,000              
        less treasury stock at cost: 3,673 shares at september 30, 2005 and 3,238 shares at december 31, 2004
                                                      -83,579,000             
        less treasury stock at cost: 4,255 shares at june 30, 2005 and 3,238 shares at december 31, 2004
                                                       -96,471,000            
        less treasury stock at cost: 4,368 shares at march 31, 2005 and 3,238 shares at december 31, 2004
                                                        -99,039,000           
        less treasury stock at cost: 3,238 shares at december 31, 2004
                                                         -78,866,000          
        less treasury stock at cost: 2,786 shares at september 30, 2004
                                                          -69,233,000         
        less treasury stock at cost: 497 at june 30, 2004
                                                           -12,371,000        
        other liabilities
                                                             145,000      
        less treasury stock at cost: 4,125 shares in 2002
                                                                   
        current assets:
                                                                   
        current liabilities:
                                                                   
        income taxes payable
                                                              207,003 2,296,876 6,132,622 5,806,883 8,647,208 
        long term liabilities:
                                                                   
        stockholders’ equity:
                                                                   
        less treasury stock at cost: 394,127 and 2,062,621 shares at september 30, 2003 and december 31, 2002, respectively
                                                              -7,832,040     
        less treasury stock at cost: 1,108,862 and 2,062,621 shares at june 30, 2003 and december 31, 2002, respectively
                                                               -21,868,677    
        less treasury stock at cost: 1,748,218 and 2,062,621 shares at march 31, 2003 and december 31, 2002, respectively
                                                                -34,133,817   
        common stock
                                                                 394,452 394,452 
        less treasury stock at cost: 2,062,621 and 910,236 shares in 2002 and 2001, respectively
                                                                   
        deferred income taxes
                                                                  5,904,755 
        less treasury stock at cost: 2,222,811 and 910,236 shares at september 30, 2002 and december 31, 2001, respectively
                                                                  -43,397,872 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-03-31 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 
                                                                
          cash flows from operating activities:
                                                                
          net income
        930,000              2,143,000 -1,127,000   5,086,000 896,000  752,000 -9,969,000   3,995,000 770,000 -8,447,000 7,589,000 -7,670,000 -10,814,000 -11,110,000 15,898,000 12,401,000 6,651,000 7,572,000 12,415,000 10,228,000 5,014,000 5,718,000 3,317,000 20,814,000 16,255,000 32,196,000 33,015,000 20,719,000 15,220,000 14,594,000 18,751,000 21,398,000 20,398,000 21,432,086 17,165,159 12,378,860 10,538,895 12,110,234 
          adjustments to reconcile net income to net cash from operating activities:
                                                                
          depreciation and amortization
        24,916,000 24,230,000 44,990,000 21,596,000 22,564,000 23,265,000 22,628,000 22,528,000 21,527,000 23,955,000 34,065,000 33,402,000 32,770,000 27,548,000 3,574,000 3,661,000 3,838,000 4,014,000 4,110,000 4,122,000 4,121,000 4,039,000 4,365,000 4,456,000 4,402,000 4,417,000 4,496,000 3,939,000 4,426,000 3,912,000 3,614,000 3,658,000 3,657,000 4,054,000 4,323,000 4,147,000 3,571,000 3,342,000 3,347,000 3,480,000 3,728,000                
          amortization of debt issuance cost
        374,000  639,000 320,000 2,937,000 1,013,000 255,000 316,000 145,000 146,000 88,000                                            
          amortization of convertible notes issuance costs
        386,000 396,000                                                       
          loss on investments
        822,000   1,631,000      1,214,000 -1,376,000 -3,154,000 -569,000 2,513,000 4,578,000 3,304,000   -2,094,000 -1,161,000                                     
          net loss on disposal of property, plant and equipment
        60,000 190,000 24,000 13,000 1,168,000   150,000             53,000 52,000 9,000 64,000 -6,000 -1,000 1,000 67,000 -135,000 1,000 5,000 -16,000 1,000 16,000 2,000 3,000 455,000 8,000                
          stock-based compensation expense
        1,819,000 1,324,000 5,888,000 3,210,000 3,925,000 3,624,000 3,836,000 3,957,000 3,787,000 4,126,000 4,291,000 3,812,000 12,410,000 12,131,000 1,888,000 1,893,000 2,023,000 1,842,000 1,808,000 1,807,000 1,610,000 1,655,000 1,791,000 1,778,000 1,871,000 1,454,000 1,859,000 1,912,000 1,640,000 1,784,000 1,819,000 1,860,000 1,834,000 1,856,000 1,883,000 2,094,000 1,492,000 1,551,000 1,558,000 1,924,000 1,639,000 2,062,000 1,967,000              
          deferred income taxes
        -244,000 -4,562,000 1,189,000 -157,000 15,646,000 285,000 6,054,000 -19,738,000 61,499,000 -13,979,000 -7,943,000 -24,019,000 -36,022,000 -26,273,000   -2,221,000 -4,000   4,000 58,000 -63,000 -351,000 32,301,000 -2,115,000 235,000 3,111,000 -3,984,000 -14,507,000 -1,877,000   -825,000 -1,947,000 -2,238,000 -93,000 -789,000 435,000 1,640,000 -692,000 -459,000 -773,000 1,459,000 -2,575,000 -313,000 -215,000 4,383,000 -579,000 -2,314,000 -2,259,000 1,838,826 660,218 76,855 236,101  
          inventory reserves
        143,000 -11,295,000 9,176,000 3,339,000 -2,687,000 2,945,000 1,885,000 1,837,000 -4,290,000 8,951,000 4,834,000 16,051,000 4,318,000 -2,385,000 -2,542,000 -1,754,000                                         
          changes in operating assets and liabilities:
                                                                
          accounts receivable
        -6,192,000 -30,596,000 25,754,000 16,011,000 -13,338,000 32,533,000 911,000 26,002,000 18,265,000 6,372,000 23,317,000 17,658,000 35,323,000 -20,220,000 -23,012,000 8,697,000 -34,518,000 -2,024,000 -19,560,000 -4,762,000 -4,404,000 -7,779,000 3,052,000 679,000 24,891,000 -17,458,000 170,000 8,034,000 -25,765,000 3,027,000 63,904,000 -42,128,000 -20,886,000 6,664,000 7,247,000 8,068,000 -12,178,000 -21,944,000 4,752,000 14,075,000 -4,571,000 -2,131,000 3,927,000 5,308,000 -7,435,000 764,000 -1,154,000 645,000 5,283,000 -2,940,000 -14,333,000 1,470,327 -2,868,637 -1,754,025 -10,349,665 6,805,103 
          other receivables
        -3,312,000 3,998,000 1,416,000 -1,141,000 5,838,000 -1,404,000 674,000 5,605,000 1,975,000 7,779,000 -1,419,000 1,980,000 -17,934,000 -4,760,000 8,811,000 -6,205,000 -1,400,000 9,740,000 2,632,000 -1,220,000 3,244,000 -2,761,000 -6,707,000 2,401,000 5,967,000 9,677,000 2,001,000 -6,680,000 -1,851,000 6,607,000 -6,598,000 -7,298,000 -3,495,000 -1,313,000 1,884,000 -3,374,000 -401,000 -2,324,000 10,200,000 1,172,000 511,000 -1,628,000 148,000 4,046,000 725,000 -3,414,000 -236,000 320,000 2,618,000 -2,229,000 1,944,000 580,799 -4,646,756 1,330,544 207,413 4,947,998 
          income taxes receivable
        896,000 2,786,000 -2,349,000 -690,000 6,330,000 -29,000 -4,357,000 -1,296,000                                                 
          inventory
        4,671,000 19,068,000 29,594,000 10,345,000 5,759,000 7,261,000 31,725,000 30,426,000 20,001,000 7,456,000 -4,156,000 -2,764,000 3,056,000 -22,311,000 -24,297,000 -29,685,000 -7,969,000 -8,609,000 4,047,000 1,893,000 -13,292,000 -6,280,000 -1,598,000 7,250,000 -10,610,000 -1,362,000 5,974,000 7,649,000 14,480,000 -1,305,000 3,368,000 -6,035,000 -1,936,000 -148,000 -7,399,000 -10,204,000 -5,621,000 4,775,000 163,000 8,068,000 -7,784,000 859,000 2,543,000 3,363,000 -6,891,000 -6,312,000 1,890,000 1,313,000 20,000 731,000 -4,405,000 -1,694,123 1,032,637 -1,931,954 2,544,440 1,519,942 
          prepaid expenses, other current assets and other assets
        -5,558,000 12,061,000 6,095,000 1,504,000 9,365,000 -5,352,000 1,151,000 -15,882,000 -31,699,000 -5,289,000 5,987,000 1,118,000  -61,000 1,841,000 -1,170,000  -3,747,000                                       
          accounts payable
        366,000 17,397,000 -6,242,000 -4,222,000 2,087,000 13,663,000 -4,519,000 553,000 -4,004,000 -19,980,000 -27,556,000 -40,367,000 -42,276,000 27,413,000 18,150,000 24,818,000 23,656,000 12,800,000 11,185,000 5,629,000 -3,185,000 14,677,000 2,712,000 -7,925,000 -10,578,000 4,843,000 166,000 -9,022,000 4,540,000 10,916,000 -10,233,000 -13,015,000 6,183,000 -9,197,000 -1,713,000 10,359,000 6,009,000 16,874,000 -6,520,000 -19,513,000 20,084,000 7,663,000 -6,348,000 -10,542,000 5,194,000 8,804,000 -630,000 -366,000 -2,802,000 572,000 631,000 2,444,978 6,042,916 -407,388 2,160,494 -8,163,999 
          accrued expenses and other liabilities
        -9,197,000 8,622,000 -11,305,000 352,000 -9,520,000 -4,113,000 11,693,000 7,459,000 11,453,000 6,366,000 -6,239,000 6,349,000 2,522,000 -25,184,000 -1,624,000 3,803,000 -329,000 3,393,000 3,682,000 3,317,000 3,521,000 8,777,000 -6,680,000 -15,162,000 9,924,000 2,995,000 -2,355,000 -3,382,000 -1,852,000 1,182,000 826,000 -2,635,000 -191,000 537,000 -3,166,000 1,485,000 5,833,000 572,000 902,000 -6,293,000 -282,000 2,303,000 -4,203,000 3,934,000 3,470,000 3,872,000 -2,017,000  -1,643,000 -999,000 -271,000      
          income taxes payable
        1,790,000 435,000 -816,000 18,000 -1,495,000 -297,000 -4,033,000 1,155,000 -6,372,000 -3,783,000 -4,100,000 10,316,000 -23,013,000 22,459,000 -293,000 -1,304,000 672,000 3,729,000 572,000 497,000 805,000 -844,000 -188,000                             826,879 -2,089,872 -3,835,746 325,739 -2,840,325 
          net cash from operating activities
        12,670,000 42,238,000 75,341,000 43,181,000 4,544,000 42,030,000 19,898,000 36,598,000 -16,290,000 6,846,000 -16,234,000 -19,926,000 -1,495,000 -36,815,000 -10,787,000 4,869,000 -25,883,000 10,678,000 7,528,000 10,685,000 -6,998,000 1,705,000 -24,000 -12,554,000 -925,000 1,295,000 9,712,000 6,761,000 -4,237,000 6,701,000 46,229,000 -64,404,000 1,446,000 11,542,000 9,037,000 14,168,000 7,215,000 4,941,000 15,676,000 -4,722,000 13,015,000 23,566,000 23,456,000 39,975,000 42,467,000 22,308,000 24,233,000 27,422,000 19,200,000 11,531,000 27,670,000 36,223,603 28,676,375 8,218,758 12,235,264 18,989,615 
          capital expenditures
        -6,209,000 -12,867,000 -10,634,000 -6,237,000 17,412,000 -18,921,000 -16,625,000 -11,685,000 -10,657,000 -13,710,000 -13,371,000 -4,085,000 -6,803,000 -6,637,000 -1,398,000 -1,069,000 -1,559,000 -1,406,000 -1,524,000 -542,000 -1,690,000 -1,846,000 -1,104,000 -3,531,000 -1,771,000 -2,503,000 -1,599,000 -2,708,000 -1,366,000 -2,119,000 -1,855,000 -2,280,000 -4,977,000 -3,692,000 -3,363,000 -7,828,000 -5,385,000 -3,444,000 -2,681,000 -4,615,000 -1,658,000 -2,125,000 -1,422,000 -1,861,000 -2,938,000 -2,574,000 -2,259,000 -1,724,000 -1,083,000 -1,928,275 -1,406,133 -983,990 
          free cash flows
        6,461,000 29,371,000 64,707,000 36,944,000 21,956,000 23,109,000 3,273,000 24,913,000 -26,947,000 -6,864,000 -29,605,000 -24,011,000 -8,298,000 -43,452,000 -12,185,000 3,800,000 -27,442,000 9,272,000 6,004,000 10,143,000 -8,688,000 -141,000 -1,128,000 -16,085,000 -2,696,000 -1,208,000 8,113,000 4,053,000 -5,603,000 4,582,000 44,374,000 -66,684,000 -3,531,000 7,850,000 5,674,000 6,340,000 1,830,000 1,497,000 12,995,000 -9,337,000 11,357,000 21,441,000 22,034,000 39,975,000 40,606,000 19,370,000 21,659,000 27,422,000 16,941,000 9,807,000 26,587,000 36,223,603 26,748,100 6,812,625 11,251,274 18,989,615 
          cash flows from investing activities:
                                                                
          purchases of property, plant and equipment
        -7,505,000 -11,671,000 -12,084,000 -7,399,000 15,729,000 -18,814,000 -15,995,000 -13,374,000 -9,447,000 -13,556,000 -11,679,000 -8,439,000 -6,931,000 -6,856,000 -1,824,000 -1,461,000 -2,097,000 -1,362,000 -1,469,000 -741,000 -1,934,000 -1,742,000 -1,406,000 -3,486,000 -1,701,000 -2,435,000 -1,872,000 -2,415,000 -1,512,000 -2,233,000 -1,950,000 -2,416,000 -4,795,000 -3,637,000 -3,872,000 -8,757,000 -6,005,000 -3,513,000 -3,166,000 -3,910,000 -2,442,000 -2,125,000 -1,422,000  -1,861,000 -2,938,000 -2,574,000  -2,259,000 -1,724,000 -1,083,000  -1,928,275 -1,406,133 -983,990  
          purchases of intangibles - developed technology
        -8,435,000 -8,037,000 -20,444,000                                                      
          proceeds from sales and maturities of available-for-sale investments
        736,000 59,000 727,000 660,000 45,000 239,000 83,000 873,000 22,000 8,471,000 1,144,000 930,000 21,187,000 5,403,000 14,806,000 10,265,000 22,161,000 7,708,000 10,510,000 10,087,000 22,827,000 16,878,000 46,440,000     36,892,000 30,321,000 37,362,000 49,074,000 36,480,000 55,381,000 57,420,000 24,471,000 83,972,000 31,110,000 49,407,000 60,586,000 90,707,000 58,075,000                
          purchases of available-for-sale investments
        -75,000 -65,000 -243,000 -170,000 -73,000 -74,000 -77,000 -44,000 -61,000 -227,000 -64,000 -516,000 -1,684,000 -5,213,000 -5,498,000 -11,504,000 -6,178,000 -8,732,000 -8,771,000 -11,350,000 -10,744,000 -15,018,000 -16,879,000     -7,938,000 -25,470,000 -13,841,000 -75,960,000 -13,428,000 -14,573,000 -35,623,000 -29,517,000 -69,991,000 -26,278,000 -60,850,000 -52,053,000 -75,694,000 -44,584,000 -53,279,000 -104,074,000 -79,862,000 -69,867,000 -48,130,000 -44,768,000 -82,788,000 -63,149,000 276,000 -357,000      
          payments for beneficial interest in securitized accounts receivable
        -574,000  -49,000                                                      
          net cash from investing activities
        -15,853,000 -20,021,000 -32,093,000 -18,338,000 -15,307,000 -18,367,000 -15,989,000 -12,545,000 -9,446,000 -5,290,000 -10,674,000 -6,794,000 12,450,000 38,597,000 7,484,000 -2,700,000 13,886,000 -1,886,000 270,000 -2,004,000 10,149,000 118,000 27,632,000 -6,134,000 -3,125,000 -381,000 -151,000 12,300,000 3,339,000 21,288,000 -36,642,000 20,771,000 36,013,000 18,160,000 -8,902,000 5,224,000 -2,116,000 -14,956,000 5,367,000 11,164,000 11,049,000 -10,774,000 -22,369,000 3,317,000 -24,357,000 -12,905,000 -6,268,000 -59,739,000 -42,728,000 66,567,000 14,079,000 10,930,771 -15,385,925 -35,215,392 -5,157,454  
          cash flows from financing activities:
                                                                
          tax withholdings related to stock-based compensation settlements
        -1,645,000 -165,000 -1,223,000 -420,000 -954,000 -13,000 -176,000 -127,000 -16,000 -57,000 -6,258,000 -3,738,000 -182,000 -279,000 -54,000 -1,747,000 -113,000                                     
          proceeds from stock option exercises
        1,369,000 395,000 1,163,000 756,000 605,000 219,000 353,000 24,000 105,000 58,000 1,470,000 4,798,000 68,000 568,000 320,000 2,559,000 2,308,000 1,244,000      162,000 952,000 369,000 6,806,000 4,884,000 345,000 1,377,000 3,641,000 535,000 294,000 247,000 54,000 280,000 562,000 2,732,000  9,023,000 1,314,000 265,000  613,000 555,000 3,878,000  18,014,382    
          payments on financing agreement
        -1,400,000                                                        
          redemption of redeemable non-controlling interest
        -8,000 -48,585,000 1,491,000 -3,000 -20,374,000                                                    
          net cash from financing activities
        -1,684,000 -28,634,000 -19,487,000 324,000 -352,000 -44,827,000 -670,000 -4,162,000 -1,444,000 -7,868,000 12,551,000 55,628,000 -8,193,000 69,703,000 -4,650,000 -3,924,000 -5,832,000 -1,830,000 -2,066,000 -3,230,000 -4,328,000 -4,337,000 -28,928,000 -5,304,000 -4,304,000 -3,777,000 -4,485,000 -6,576,000 -4,756,000 -6,915,000 -14,169,000 1,369,000 535,000 -15,757,000 -8,551,000 -4,710,000 -10,173,000 -9,689,000 -15,209,000 -5,858,000 -7,557,000 -88,904,000 -3,473,000 -521,000 -1,137,000 -4,712,000 -26,586,000 -16,385,000 -63,483,000 -18,157,000 -2,487,000 9,866,837 -64,977,207 14,780,495 6,489,875  
          net increase in cash and cash equivalents
        -4,867,000  23,761,000 25,167,000 -11,115,000 -21,164,000 3,239,000 19,891,000 -27,180,000 -6,312,000             -1,320,000 -23,992,000 -8,354,000 -2,863,000 5,076,000 12,485,000 -5,654,000   -42,264,000 37,994,000 13,945,000 -8,416,000 14,682,000 -5,074,000 -19,704,000 5,834,000 584,000 16,507,000   42,771,000 16,973,000 4,691,000 -8,621,000 -48,702,000 -87,011,000 59,941,000 39,262,000 57,021,211 -51,686,757 -12,216,139 13,567,685 40,175,215 
          effect of exchange rate changes
        -2,559,000 884,000 6,489,000 133,000 226,000 -1,565,000 1,189,000 -301,000 -1,745,000 -1,890,000 2,194,000 -1,095,000 -5,217,000 -3,754,000 -2,710,000 -1,032,000 -958,000 -1,338,000 353,000 -1,734,000 2,335,000 1,474,000 -1,168,000 1,358,000 -2,056,000 561,000 -1,461,000 -1,154,000 -492,000 -3,378,000 772,000 444,000 1,461,000 2,295,000 1,079,000 -1,079,000 452,000 -991,000 1,225,000 279,000 -2,937,000 620,000 -248,000 -562,000 179,000 -150,000 -89,000 89,000 346,000 -203,000 -168,000 129,133 -36,313 183,047 18,133  
          cash and cash equivalents, beginning of period
        95,696,000  76,021,000 76,021,000  87,167,000  108,644,000           73,773,000  105,504,000  86,433,000  79,895,000  84,550,000  73,439,000 112,794,000  57,602,000  132,072,000  125,092,393  
          cash and cash equivalents, end of period
        88,270,000  106,271,000 101,321,000  -22,729,000 4,428,000 106,757,000  -8,202,000 -12,163,000 136,457,000           71,285,000  -10,410,000 -2,302,000 109,119,000  -6,146,000 17,696,000 82,623,000  39,455,000 16,240,000 72,558,000  -4,622,000 -20,695,000 91,609,000  87,009,000 -75,492,000 110,160,000  17,152,000 4,541,000 48,892,000  -86,665,000 59,738,000 171,166,000  -51,723,070 -12,033,092 138,678,211  
          supplemental disclosure of cash financing activities:
                                                                
          cash paid for interest
        4,451,000  8,049,000 4,129,000 2,659,000 11,671,000 1,311,000 5,243,000 4,056,000 3,821,000 3,109,000 1,610,000 1,095,000                                            
          cash (refund) paid for income taxes
        -814,000                                                        
          cash from operating activities related to operating leases
        2,425,000 2,479,000 5,236,000 2,696,000 1,894,000 2,600,000 2,396,000 2,384,000 2,304,000 2,296,000 1,025,000 4,057,000                                             
          supplemental disclosure of non-cash investing and financing activities:
                                                                
          right-of-use assets obtained in exchange for lease obligations
        183,000 2,743,000 3,538,000 1,893,000 3,195,000 123,000 1,157,000 842,000 9,375,000 7,975,000 29,000 486,000 2,506,000 352,000 220,000 332,000  1,558,000 27,000 248,000                                     
          purchases of property, plant and equipment included in accounts payable
        1,296,000 -1,158,000 1,450,000 1,162,000 1,683,000 -107,000 -630,000 1,689,000 -1,210,000 -154,000 -1,692,000 4,354,000 128,000 219,000 426,000 392,000 538,000 -44,000 -55,000 199,000 244,000 -104,000 302,000 -45,000 -70,000 -68,000 273,000 -293,000 146,000 114,000 95,000 136,000 -182,000 -55,000 509,000 929,000 620,000 69,000 485,000 -705,000 784,000                
          net loss
         -1,280,000 -27,206,000 -8,948,000 -43,510,000   -321,670,000    -40,453,000                                             
          adjustments to reconcile net loss to net cash from operating activities:
                                                                
          goodwill impairment
            292,583,000                                                
          amortization of revolving credit facility issuance costs
         376,000                                                       
          accretion on available-for-sale investments
                                                                
          gain on investments
         -912,000 -1,506,000   -1,371,000 -246,000 -2,621,000         -1,807,000                                        
          inventory write down - business efficiency program
                                                              
          other
             -141,000 -671,000 545,000 -3,146,000 74,000 131,000 -1,000  5,000 89,000 -62,000 23,000 36,000 -31,000 84,000                                     
          change in operating assets and liabilities:
                                                                
          (payments for) proceeds from beneficial interests in securitized accounts receivable
                                                                
          dividend payments
                -7,081,000 -7,080,000 -7,076,000 -7,026,000 -6,982,000 -4,439,000 -4,438,000 -4,405,000 -4,389,000 -4,374,000 -4,361,000 -4,328,000 -4,337,000 -4,328,000 -4,304,000 -4,304,000 -4,303,000 -4,301,000 -4,291,000 -4,297,000 -4,312,000 -4,367,000 -4,337,000 -4,312,000 -4,350,000 -4,369,000 -4,353,000 -4,370,000 -4,407,000 -4,453,000 -4,460,000 -4,811,000 -6,881,000 -6,898,000 -6,857,000 -6,823,000 -6,026,000 -6,114,000 -6,151,000 -6,258,000 -6,341,000 -6,365,000 -5,935,411     
          proceeds from receivables purchase agreement
            38,325,000 30,231,000                                                 
          repayments on receivables purchase agreement
            -17,373,000 -33,962,000 -32,437,000                                                 
          proceeds from draw on revolving credit agreement
         25,000,000                                                       
          repayment of revolving credit agreement
         -25,000,000                                                       
          payment of annual recurring compensation to non-controlling interest
                                                               
          payment of debt issuance cost
          -64,000  -1,994,000                                               
          proceeds from issuance of senior convertible notes
                                                                
          payments for capped call transactions related to convertible senior notes
                                                               
          repayment of notes payable
                40,000 -46,000 -193,000 -24,692,000 -7,645,000                                            
          cash and cash equivalents, beginning of year
                                                                
          cash and cash equivalents, end of year
                                                                
          purchases of property, plant and equipment included in other non-current liabilities
         -38,000                                                       
          proceeds from issuance of convertible notes
                                                                
          payment for redemption of redeemable non-controlling interest
          -19,363,000 -12,000  -17,370,000 -20,000 -5,000                                                 
          payment of debt issuance costs on revolving credit facility and convertible notes
                                                                
          net increase in cash, cash equivalents and restricted cash
                   28,908,000  71,485,000 -7,953,000 -1,755,000  6,962,000 5,732,000 5,451,000                                     
          cash, cash equivalents and restricted cash, end of period
                     67,731,000 -10,663,000 54,031,000  5,624,000 6,085,000 63,896,000 1,158,000                                    
          cash paid for interest expense
                                                                
          cash paid for income taxes, net of refunds
          4,155,000                                                      
          debt issuance costs included in accrued expenses and other liabilities
                                                                
          proceeds from draw on revolving credit agreements
          24,000,000      -27,000 31,000 25,493,000 138,236,000 8,746,000                                            
          repayment of revolving credit agreements
          -24,000,000  -26,000,000   -15,754,000 -78,000 -5,691,000 -43,464,000                                            
          supplemental disclosure of non-cash investing activities:
                                                                
          purchases of intangibles - developed technologies
           -11,296,000                                                     
          payments for beneficial interests in securitized accounts receivable
           -133,000                                                     
          cash paid for income taxes
           2,367,000  1,689,000 5,118,000 2,315,000                                                 
          asset impairment
                                                                
          amortization on available-for-sale investments
                                                                
          (payments) for and proceeds from beneficial interests in securitized accounts receivable
                                                                
          proceeds from disposals of property, plant and equipment
                                      135,000 16,000     61,000                 
          acquisition of business, net of cash acquired
                    46,000                                            
          cash, cash equivalents and restricted cash, beginning of year
                                                                
          cash, cash equivalents and restricted cash, end of year
                                                                
          supplemental disclosure of cash flow information:
                                                                
          adtran networks common shares exchanged in acquisition
                                                                
          adtran networks options assumed in acquisition
                                                                
          non-controlling interest related to adtran networks
                                                                
          proceeds from beneficial interests in securitized accounts receivable
                40,000 22,000 -75,000 1,231,000 -168,000                                            
          payment for annual recurring compensation to non-controlling interest
                                                                
          net income on disposal of property, plant and equipment
                                                                
          inventory write down
               3,992,000 3,270,000                                                
          payment for beneficial interests in securitized accounts receivable
                                                                
          (gain) loss on investments
                                                                
          insurance proceeds received
                                                               
          supplemental disclosure of cash financing activities
                                                                
          supplemental disclosure of non-cash investing activities
                                                                
          non-controlling interest put option buyback
                 6,000 -26,000 -1,176,000                                             
          asset impairments
                            65,000                                 
          amortization of net discount on available-for-sale investments
                                                                
          prepaid expenses other current assets and other assets
                                                                
          acquisition of note receivable
                            -523,000                                  
          repayment of bonds payable
                            -24,600,000                                  
          adva common shares exchanged in acquisition
                                                               
          adva options assumed in acquisition
                                                               
          non-controlling interest related to adva
                                                               
          cash, cash equivalents and restricted cash, beginning of period
                     56,818,000  60,179,000                                    
          proceeds from draw on line of credit
                      20,000,000 8,000,000                                         
          repayment of line of credit
                      -20,000,000 -8,000,000                                         
          gain on contingency payment
                                                                
          gain on life insurance proceeds
                                                              
          prepaid expenses and other assets
                           -417,000 -2,116,000 -762,000 2,206,000 12,820,000 -14,786,000 1,906,000 2,809,000 2,005,000 -1,435,000 -426,000 10,583,000 4,817,000 206,000 -7,440,000 -2,413,000 -1,928,000 -917,000 -1,180,000 -3,083,000 -3,405,000 -213,000 -1,057,000 390,000 598,000 590,000 -800,000 -536,000 550,000 -574,000 315,000 -863,000 -67,039 41,433 186,935 336,671 158,730 
          acquisition of business
                                   -7,806,000                         
          purchases of treasury stock
                               -184,000 -1,347,000 -1,411,000 -2,603,000 -10,171,000 -37,000 -11,752,000 -5,559,000 -2,900,000 -6,338,000 -5,576,000 -11,003,000 -352,000 -3,035,000    -3,337,000 -20,737,000  -57,838,000        
          payments on long-term debt
                                                                
          supplemental disclosure of cash flow information
                                                                
          cash paid during the year for interest
                                                                
          cash paid during the year for income taxes
                                                                
          supplemental cash flow information:
                                                                
          non-cash investing activities:
                                                                
          amortization of net premium on available-for-sale investments
                            4,000 25,000 61,000   -63,000 6,000  -34,000 -22,000 42,000 73,000 114,000 114,000 124,000 154,000 113,000 156,000 220,000 317,000 910,000                
          net gain on long-term investments
                                216,000                                
          gain on contingency
                                                               
          life insurance proceeds received
                                                              
          net decrease in cash, cash equivalents and restricted cash
                                                                
          net loss on long-term investments
                             -9,852,000 10,877,000    -5,926,000                              
          amortization of net premium (discount) on available-for-sale investments
                               -14,000                                 
          gain on bargain purchase of a business
                                   -11,322,000     8,000                     
          contingent payment
                                                                
          income tax payable
                                -2,243,000 -2,343,000 -487,000  2,516,000 4,192,000 2,753,000        413,000  -524,000 -7,237,000 7,046,000  9,510,000 -4,719,000 6,335,000  -2,422,000 -6,649,000 8,926,000      
          proceeds from sales and maturities of debt and equity investments
                                14,255,000 7,267,000 17,039,000                              
          purchases of debt and equity investments
                                -15,679,000 -6,226,000 -15,318,000                              
          contingent payments
                                                                
          net realized gain on long-term investments
                                       -1,816,000 -1,009,000 -1,390,000 -470,000    -1,728,000 -1,907,000 -3,115,000                
          net realized loss on long-term investments
                                      97,000                          
          net decrease in cash and cash equivalents
                                      -4,582,000           -76,112,000 -2,386,000              
          cash flows from operating activities
                                                                
          tax impact of stock option exercises
                                                                
          cash flows from investing activities
                                                                
          cash flows from financing activities
                                                                
          income tax payable/receivable
                                        -1,702,000 6,224,000 4,049,000  1,858,000                    
          excess tax benefits from stock-based compensation arrangements
                                               -9,000 -125,000 -693,000              
          net realized investment gain
                                            -1,316,000                    
          tax benefit from stock option exercises
                                                8,000                
          depreciation
                                                 2,757,000 2,737,000 2,997,000 3,059,000 3,526,000 3,617,000 4,284,000 3,709,000 3,688,000 3,692,000 3,768,006 3,756,848 3,828,516 3,893,630 3,986,549 
          gain on sale of long-term investments
                                                 -474,000 -600,000 -437,000             
          loss on disposition of property, plant and equipment
                                                                
          tax benefits from stock option exercises
                                                 213,000 1,058,000              
          proceeds from disposition of property, plant and equipment
                                                    2,000  32,000 2,000     
          proceeds from sales of available-for-sale investments
                                                 44,530,000 83,627,000  47,371,000 38,163,000 41,072,000  22,375,000 67,037,000 14,463,000      
          loss on sale of property, plant and equipment
                                                  2,000 5,000   58,000 9,000 -2,000 -1,481 4,481 32,425 
          acquisition of business assets
                                                  -500,000              
          non-cash compensation expense
                                                                
          income tax benefit from exercise of non-qualified stock options
                                                   3,610,000 3,931,000   281,000 163,000 290,000 2,230,000 17,155,394     
          income tax receivable
                                                   2,442,000 237,000 -2,679,000 -270,000 11,856,000      
          expenditures for property, plant and equipment
                                                                
          proceeds from the disposition of property, plant and equipment
                                                                
          proceeds from sale of available-for-sale investments
                                                                
          proceeds from maturities of held-to-maturity investments
                                                       2,415,000 305,000 946,000 1,054,000      
          purchases of held-to-maturity investments
                                                                
          proceeds from issuance of common stock
                                                              6,489,875 3,222,717 
          purchase of treasury stock
                                                                
          loss on sale of long-term investments
                                                     -259,000 -481,000   -71,000 126,000 451 -224,674 -1,777 93,796 
          gain on sale of property, plant and equipment
                                                      -2,000          
          loss on sale of short-term investments
                                                                
          write-down of equity and debt securities
                                                                
          accrued expenses and unearned revenue
                                                                
          write-down of other equity and debt securities
                                                                
          accrued expenses
                                                           -326,500 3,099,823 -1,429,165 2,338,842 -1,477,442 
          gain on sale of short-term investments
                                                                
          impairment of investments
                                                                
          proceeds from sales of short-term investments
                                                            10,745,660 -3,199,125 8,796,971  
          purchases of short-term investments
                                                            -5,865,569 21,182,658 -28,616,087  
          proceeds from sales of long-term investments
                                                            19,250,001 21,093,280 28,117,700  
          purchases of long-term investments
                                                            -37,587,742 -72,886,072 -12,479,048  
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                
          write-down of equity securities
                                                                
          proceeds from disposition of property, plant, and equipment
                                                              7,000  
          income tax benefit from exercise of non-qualifying stock options
                                                                
          proceeds from sale of long-term investments
                                                                
          proceeds from sale of short-term investments