7Baggers

Barrett Business Services, Inc
(NASDAQ:BBSI) 

BBSI stock logo

Barrett Business Services, Inc. provides business management solutions for small and mid-sized companies in the United States. It develops a management platform that integrates a knowledge-based approach from the management consulting industry with tools from the human resource outsourcing industry....

Founded: 1965
Full Time Employees: 127,085
Sector: Industrials
Industry: Staffing & Employment Services

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Quarterly
Annual
    Unit: USD2025-12-31 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 2020-12-31 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 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2005-12-31 
                                                                                  
      revenues:
                                                                                  
      professional employer services
    303,553,000 299,685,000 290,170,000 274,926,000 284,517,000 272,793,000 259,887,000 246,189,000 254,282,000 251,423,000 244,256,000 232,307,000 243,189,000 244,567,000                                                                 
      staffing services
    17,573,000 19,264,000 17,487,000 17,640,000 20,303,000 21,485,000 19,764,000 19,593,000 22,400,000 21,905,000 20,374,000 22,360,000 28,761,000 29,255,000 30,005,000 28,942,000 33,040,000 28,978,000 24,707,000 24,626,000 28,908,000 28,431,000 20,543,000 25,512,000 33,119,000 33,806,000 27,825,000 27,688,000 36,992,000 40,967,000 34,326,000 35,014,000 43,995,000 42,747,000 37,856,000 37,788,000 44,856,000 47,874,000 37,641,000 36,290,000  42,347,000 39,166,000 45,313,000 48,503,000 38,566,000 33,451,000 37,117,000 41,727,000 35,304,000 29,733,000 33,855,000 36,195,000 30,387,000 26,210,000 31,322,000 34,589,000 30,518,000 28,332,000 32,747,000 33,954,000 31,975,000 27,062,000 30,931,000 33,180,000 28,002,000 24,042,000 33,674,000 44,468,000 40,604,000 35,819,000 45,548,000 43,911,000 29,747,000 28,015,000 32,766,000 33,506,000  
      total revenues
    321,126,000 318,949,000 307,657,000 292,566,000 304,820,000 294,278,000 279,651,000 265,782,000 276,682,000 273,328,000 264,630,000 254,667,000 271,950,000 273,822,000 262,179,000 246,375,000 256,568,000 246,950,000 233,203,000 218,445,000 233,176,000 227,513,000 201,031,000 219,104,000 245,152,000 247,962,000 230,982,000 218,215,000 237,832,000 247,287,000 231,603,000 223,975,000 244,726,000 240,135,000 225,574,000 209,997,000 221,098,000 225,103,000 203,417,000 190,968,000  182,395,000 166,917,000 115,292,000 174,959,000 151,069,000 135,140,000 97,080,000 147,971,000 128,798,000 111,551,000 72,247,750 111,069,000 95,500,000 82,422,000 57,541,500 85,384,000 76,013,000 68,769,000 49,892,000 73,876,000 67,432,000 58,260,000 43,457,750 65,494,000 57,265,000 51,072,000 53,959,500 77,461,000 72,183,000 66,194,000 51,845,500 82,908,000 63,886,000 60,588,000 48,090,750 69,423,000  
      yoy
    5.35% 8.38% 10.01% 10.08% 10.17% 7.66% 5.68% 4.36% 1.74% -0.18% 0.93% 3.37% 6.00% 10.88% 12.43% 12.79% 10.03% 8.54% 16.00% -0.30% -4.89% -8.25% -12.97% 0.41% 3.08% 0.27% -0.27% -2.57% -2.82% 2.98% 2.67% 6.66% 10.69% 6.68% 10.89% 9.96%  23.42% 21.87% 65.64%  20.74% 23.51% 18.76% 18.24% 17.29% 21.15% 34.37% 33.22% 34.87% 35.34% 25.56% 30.08% 25.64% 19.85% 15.33% 15.58% 12.73% 18.04% 14.81% 12.80% 17.75% 14.07% -19.46% -15.45% -20.67% -22.84% 4.08% -6.57% 12.99% 9.25% 7.81% 19.42%      
      qoq
    0.68% 3.67% 5.16% -4.02% 3.58% 5.23% 5.22% -3.94% 1.23% 3.29% 3.91% -6.36% -0.68% 4.44% 6.41% -3.97% 3.89% 5.89% 6.76% -6.32% 2.49% 13.17% -8.25% -10.63% -1.13% 7.35% 5.85% -8.25% -3.82% 6.77% 3.41% -8.48% 1.91% 6.46% 7.42% -5.02% -1.78% 10.66% 6.52%   9.27% 44.78% -34.10% 15.81% 11.79% 39.20% -34.39% 14.89% 15.46% 54.40% -34.95% 16.30% 15.87% 43.24% -32.61% 12.33% 10.53% 37.84% -32.47% 9.56% 15.74% 34.06% -33.65% 14.37% 12.13% -5.35% -30.34% 7.31% 9.05% 27.68% -37.47% 29.77% 5.44% 25.99% -30.73%   
      cost of revenues:
                                                                                  
      direct payroll costs
    13,368,000 14,604,000 13,165,000 13,306,000 15,392,000 16,208,000 14,693,000 14,717,000 16,743,000 16,318,000 15,110,000 16,871,000 21,453,000 22,112,000 22,458,000 21,921,000 25,003,000 21,870,000 18,498,000 18,450,000 22,055,000 21,452,000 15,796,000 19,077,000 25,157,000 25,464,000 20,992,000 20,842,000 28,178,000 30,842,000 26,020,000 26,404,000 33,351,000 31,986,000 28,486,000 28,710,000 34,086,000 37,017,000 28,223,000 27,427,000  32,188,000 29,764,000 34,584,000 37,087,000 29,311,000 25,417,000 28,308,000 31,585,000 26,611,000 22,296,000 25,475,000 27,158,000 22,843,000 19,652,000 23,735,000 26,292,000 23,093,000 21,448,000 24,920,000 25,846,000 24,237,000 20,436,000 23,388,000 25,095,000 21,127,000 18,069,000 25,173,000 32,941,000 29,943,000 26,383,000 34,250,000 35,642,000 22,416,000 21,142,000 24,849,000 25,145,000  
      payroll taxes and benefits
    184,245,000 176,270,000 173,277,000 187,006,000 163,720,000 154,109,000 148,810,000 161,895,000 141,363,000 135,704,000 134,109,000 144,582,000 131,715,000 128,459,000 126,353,000 135,865,000 120,374,000 115,012,000 111,719,000 122,783,000 105,518,000 100,142,000 93,671,000 119,462,000 108,372,000 104,847,000 101,697,000 114,797,000 84,219,000 100,348,000 98,249,000 124,188,000 100,419,000 94,922,000 93,946,000 115,400,000 88,334,000 82,888,000 82,885,000 103,760,000  72,146,000 88,294,000 67,836,000 65,061,000 61,130,000 72,817,000 58,320,000 57,977,000 53,483,000 59,123,000 44,485,000 42,915,000 39,332,000 42,992,000 32,047,000 30,321,000 28,886,000 31,763,000 24,670,000 24,501,000 22,861,000 24,628,000 19,617,000 20,399,000 19,434,000 22,627,000 19,164,000 21,201,000 20,721,000 24,445,000 21,534,000 21,835,000 20,542,000 23,911,000 20,079,000 20,403,000  
      workers' compensation
    55,248,000 51,310,000 47,956,000 49,630,000 54,333,000 49,549,000 48,251,000 49,603,000 52,963,000 52,977,000 48,365,000 51,670,000 58,076,000 56,350,000 46,483,000 48,236,000 55,256,000 49,833,000 45,513,000 46,347,000 54,624,000 46,685,000 44,921,000 54,514,000 57,600,000 46,887,000 53,174,000 54,229,000 63,191,000 56,412,000 58,854,000 57,121,000 62,006,000 58,310,000 58,928,000 55,437,000                                           
      total cost of revenues
    252,861,000 242,184,000 234,398,000 249,942,000 233,445,000 219,866,000 211,754,000 226,215,000 211,069,000 204,999,000 197,584,000 213,123,000 211,244,000 206,921,000 195,294,000 206,022,000 200,633,000 186,715,000 175,730,000 187,580,000 182,197,000 168,279,000 154,388,000 193,053,000 191,129,000 177,198,000 175,863,000 189,868,000 175,588,000 187,602,000 183,123,000 207,713,000 195,776,000 185,218,000 181,360,000 199,547,000 177,761,000 175,544,000 161,164,000 180,581,000  146,231,000 157,941,000 116,198,000 217,741,000 121,217,000 125,834,000 81,524,250 117,785,000 105,072,000 103,240,000 61,132,250 89,505,000 79,159,000 75,865,000 48,783,500 69,231,000 62,732,000 63,171,000 42,097,500 59,820,000 55,687,000 52,883,000 40,056,000 53,353,000 59,488,000 47,383,000 44,578,250 62,552,000 58,129,000 57,632,000 40,982,250 64,110,000 48,922,000 50,897,000 38,115,750 52,755,000  
      gross margin
    68,265,000 76,765,000 73,259,000 42,624,000 71,375,000 74,412,000 67,897,000 39,567,000 65,613,000 68,329,000 67,046,000 41,544,000 60,706,000 66,901,000 66,885,000 40,353,000 55,935,000 60,235,000 57,473,000 30,865,000 50,979,000 59,234,000 46,643,000 26,051,000 54,023,000 70,764,000 55,119,000 28,347,000 62,244,000 59,685,000 48,480,000 16,262,000 48,950,000 54,917,000 44,214,000 10,450,000 43,337,000 49,559,000 42,253,000 10,387,000  36,164,000 8,976,000 34,041,000 -42,782,000 29,852,000 9,306,000 24,301,000 30,186,000 23,726,000 8,311,000 22,252,000 21,564,000 16,341,000 6,557,000 8,420,000 16,153,000 13,281,000 5,598,000 13,562,000 14,056,000 11,745,000 5,377,000 11,988,000 12,141,000 -2,223,000 3,689,000 12,085,000 14,909,000 14,054,000 8,562,000 15,457,000 18,798,000 14,964,000 9,691,000 15,653,000 16,668,000  
      yoy
    -4.36% 3.16% 7.90% 7.73% 8.78% 8.90% 1.27% -4.76% 8.08% 2.13% 0.24% 2.95% 8.53% 11.07% 16.38% 30.74% 9.72% 1.69% 23.22% 18.48% -5.63% -16.29% -15.38% -8.10% -13.21% 18.56% 13.69% 74.31% 27.16% 8.68% 9.65% 55.62% 12.95% 10.81% 4.64% 0.61%  37.04% 370.73% -69.49%  21.14% -3.55% 40.08% -241.73% 25.82% 11.97% 9.21% 39.98% 45.19% 26.75% 164.28% 33.50% 23.04% 17.13% -37.91% 14.92% 13.08% 4.11% 13.13% 15.77% -628.34% 45.76% -0.80% -18.57% -115.82% -56.91% -21.82% -20.69% -6.08% -11.65% -1.25% 12.78%      
      qoq
    -11.07% 4.79% 71.87% -40.28% -4.08% 9.60% 71.60% -39.70% -3.97% 1.91% 61.39% -31.57% -9.26% 0.02% 65.75% -27.86% -7.14% 4.81% 86.21% -39.46% -13.94% 26.99% 79.04% -51.78% -23.66% 28.38% 94.44% -54.46% 4.29% 23.11% 198.12% -66.78% -10.87% 24.21% 323.10% -75.89% -12.55% 17.29% 306.79%   302.90% -73.63% -179.57% -243.31% 220.78% -61.71% -19.50% 27.23% 185.48% -62.65% 3.19% 31.96% 149.21% -22.13% -47.87% 21.62% 137.25% -58.72% -3.51% 19.68% 118.43% -55.15% -1.26% -646.15% -160.26% -69.47% -18.94% 6.08% 64.14% -44.61% -17.77% 25.62% 54.41% -38.09% -6.09%   
      gross margin %
    21.26% 24.07% 23.81% 14.57% 23.42% 25.29% 24.28% 14.89% 23.71% 25.00% 25.34% 16.31% 22.32% 24.43% 25.51% 16.38% 21.80% 24.39% 24.65% 14.13% 21.86% 26.04% 23.20% 11.89% 22.04% 28.54% 23.86% 12.99% 26.17% 24.14% 20.93% 7.26% 20.00% 22.87% 19.60% 4.98% 19.60% 22.02% 20.77% 5.44% NaN% 19.83% 5.38% 29.53% -24.45% 19.76% 6.89% 25.03% 20.40% 18.42% 7.45% 30.80% 19.41% 17.11% 7.96% 14.63% 18.92% 17.47% 8.14% 27.18% 19.03% 17.42% 9.23% 27.59% 18.54% -3.88% 7.22% 22.40% 19.25% 19.47% 12.93% 29.81% 22.67% 23.42% 15.99% 32.55% 24.01%  
      selling, general and administrative expenses
    47,582,000 49,886,000 48,188,000 44,838,000 48,818,000 49,060,000 45,577,000 42,414,000 45,578,000 44,160,000 43,808,000 41,226,000 44,204,000 43,001,000 42,272,000 40,165,000 41,320,000 41,170,000 35,662,000 37,107,000 40,959,000 35,587,000 33,255,000 32,115,000 40,362,000 41,352,000 39,005,000 33,160,000 43,752,000 36,670,000 35,614,000 29,428,000 34,543,000 33,925,000 28,060,000 26,610,000 32,508,000 30,440,000 28,490,000 21,904,000  21,278,000 16,975,000 20,281,000 21,213,000 17,958,000 14,369,000 16,948,000 16,808,000 14,494,000 11,811,000 13,392,000 12,745,000 10,549,000 9,762,000 10,597,000 9,879,000 8,871,000 8,827,000 9,642,000 9,156,000 8,407,000 8,224,000 8,689,000 8,416,000 8,336,000 8,040,000 8,813,000 10,007,000 9,165,000 8,669,000 10,043,000 9,530,000 7,727,000 7,388,000 5,866,000 8,362,000  
      depreciation and amortization
    2,163,000 2,097,000 2,038,000 1,958,000 1,938,000 1,899,000 1,912,000 1,852,000 1,837,000 1,867,000 1,729,000 1,677,000 1,643,000 1,554,000 1,523,000 1,508,000 1,359,000 1,342,000 1,328,000 1,297,000 1,332,000 1,341,000 1,171,000 1,000,000 977,000 970,000 970,000 969,000 991,000 949,000 1,274,000 1,004,000 2,463,000 1,062,000 985,000 942,000 912,000 823,000 769,000 749,000  709,000 683,000 663,000 646,000 613,000 584,000 550,000 521,000 506,000 460,000 401,000 372,000 357,000 348,000 344,000 334,000 331,000 335,000 344,000 341,000 333,000 377,000 423,000 422,000 410,000 386,000 393,000 385,000 382,000 376,000 372,000 350,000 316,000 349,000 341,000 335,000  
      income from operations
    18,520,000 24,782,000 23,033,000 -4,172,000 20,619,000 23,453,000 20,408,000 -4,699,000 18,198,000 22,302,000 21,509,000 -1,359,000 14,859,000 22,346,000 23,090,000 -1,320,000 13,256,000 17,723,000 20,483,000 -7,539,000 8,688,000 22,306,000 12,217,000 -7,064,000 12,684,000 28,442,000 15,144,000 -5,782,000 17,501,000 22,066,000 11,592,000 -14,170,000 11,944,000 19,930,000 15,169,000 -17,102,000 9,917,000 18,296,000 12,994,000 -12,266,000  14,177,000 -8,682,000 13,097,000 -64,641,000 11,281,000 -5,647,000 6,803,000 12,857,000 8,726,000 -3,960,000 8,459,000 8,447,000 5,435,000 -3,553,000 -2,521,000 5,940,000 4,079,000 -3,564,000 3,576,000 4,559,000 3,005,000 -3,224,000 2,876,000 3,303,000 -10,969,000 -4,737,000 2,879,000 4,517,000 4,507,000 -483,000 5,042,000 8,918,000 6,921,000 1,954,000 7,172,000 7,971,000  
      yoy
    -10.18% 5.67% 12.86% -11.22% 13.30% 5.16% -5.12% 245.77% 22.47% -0.20% -6.85% 2.95% 12.09% 26.08% 12.73% -82.49% 52.58% -20.55% 67.66% 6.72% -31.50% -21.57% -19.33% 22.17% -27.52% 28.90% 30.64% -59.20% 46.53% 10.72% -23.58% -17.14% 20.44% 8.93% 16.74% 39.43%  29.05% -249.67% -193.66%  25.67% 53.75% 92.52% -602.77% 29.28% 42.60% -19.58% 52.21% 60.55% 11.46% -435.54% 42.21% 33.24% -0.31% -170.50% 30.29% 35.74% 10.55% 24.34% 38.03% -127.40% -31.94% -0.10% -26.88% -343.38% 880.75% -42.90% -49.35% -34.88% -124.72% -29.70% 11.88%      
      qoq
    -25.27% 7.59% -652.09% -120.23% -12.08% 14.92% -534.31% -125.82% -18.40% 3.69% -1682.71% -109.15% -33.50% -3.22% -1849.24% -109.96% -25.20% -13.47% -371.69% -186.77% -61.05% 82.58% -272.95% -155.69% -55.40% 87.81% -361.92% -133.04% -20.69% 90.36% -181.81% -218.64% -40.07% 31.39% -188.70% -272.45% -45.80% 40.80% -205.94%   -263.29% -166.29% -120.26% -673.01% -299.77% -183.01% -47.09% 47.34% -320.35% -146.81% 0.14% 55.42% -252.97% 40.94% -142.44% 45.62% -214.45% -199.66% -21.56% 51.71% -193.21% -212.10% -12.93% -130.11% 131.56% -264.54% -36.26% 0.22% -1033.13% -109.58% -43.46% 28.85% 254.20% -72.76% -10.02%   
      operating margin %
    5.77% 7.77% 7.49% -1.43% 6.76% 7.97% 7.30% -1.77% 6.58% 8.16% 8.13% -0.53% 5.46% 8.16% 8.81% -0.54% 5.17% 7.18% 8.78% -3.45% 3.73% 9.80% 6.08% -3.22% 5.17% 11.47% 6.56% -2.65% 7.36% 8.92% 5.01% -6.33% 4.88% 8.30% 6.72% -8.14% 4.49% 8.13% 6.39% -6.42% NaN% 7.77% -5.20% 11.36% -36.95% 7.47% -4.18% 7.01% 8.69% 6.77% -3.55% 11.71% 7.61% 5.69% -4.31% -4.38% 6.96% 5.37% -5.18% 7.17% 6.17% 4.46% -5.53% 6.62% 5.04% -19.15% -9.28% 5.34% 5.83% 6.24% -0.73% 9.73% 10.76% 10.83% 3.23% 14.91% 11.48%  
      other income:
                                                                                  
      investment income
    2,356,000 1,983,000 2,300,000 2,620,000 2,522,000 2,265,000 3,069,000 3,274,000 1,787,000 2,412,000 2,129,000 2,315,000 1,686,000 1,584,000 1,568,000 1,638,000 1,656,000 1,825,000 1,965,000 1,769,000 1,546,000 1,664,000 1,800,000 2,967,000 3,234,000 2,882,000 3,332,000 3,072,000 2,622,000 2,235,000 2,201,000 2,019,000 1,584,000 1,534,000 1,392,000 158,000 254,000 194,000 259,000 248,000  148,000 89,000 138,000 155,000 157,000 144,000 224,000 154,000 173,000 173,000 110,000 162,000 205,000 222,000 206,000 340,000 273,000 355,000 204,000 244,000 217,000 184,000 209,000 305,000 239,000 250,000 434,000 470,000 535,000 640,000 781,000 814,000 808,000 779,000 766,000 753,000  
      interest expense
    -38,000 -45,000 -44,000 -44,000 -45,000 -45,000 -44,000 -44,000 -48,000 -80,000  -38,000 -39,000 -35,000 -33,000 -34,000 61,000 -46,000 -79,000 -308,000 -337,000 -366,000 -306,000 -235,000 -437,000 -394,000 -481,000 -477,000 -478,000 -465,000 -68,000 -42,000 -116,000 -52,000 -62,000 -83,000 -103,000 -196,000 -248,000 -260,000  -562,000 -520,000 -42,000 -43,000 -44,000 -44,000 -47,000 -48,000 -64,000 -80,000                    -3,000  -1,000  -2,000 -16,000 -18,000  
      other
    17,000 32,000 41,000 58,000 -35,000 31,000 27,000 66,000 -232,000 38,000 19,000 36,000 -77,000 19,000 19,000 32,000 -101,000  -13,000 9,000 -453,000 -4,000 172,000 1,000 -93,000   12,000 -260,000 10,000 -12,000 16,000 54,000 32,000 -4,000  14,000 27,000 -5,000 4,000  -65,000 -14,000 -9,000 178,000 -7,000 -10,000 -7,000 3,000 1,000 -6,000 -6,000 -6,000 -9,000 -7,000 -37,000 -8,000 -7,000 99,000 554,000 344,000 163,000 101,000 58,000 660,000 54,000 -135,000 -58,000 -5,000 52,000 -11,000 -49,000 -37,000 -18,000 8,000 62,000 -2,000  
      other income
    2,335,000 1,970,000 2,297,000 2,634,000 2,442,000 2,251,000 3,052,000 3,296,000 1,507,000 2,370,000 2,148,000 2,313,000 1,570,000 1,568,000 1,554,000 1,636,000 1,616,000 1,779,000 1,873,000 1,470,000 756,000 1,294,000 1,666,000 2,733,000 2,704,000 2,488,000 2,851,000 2,607,000 1,884,000 1,780,000 2,121,000 1,993,000 1,522,000 1,514,000 1,326,000 75,000   6,000   -479,000 -445,000 121,500 290,000 106,000 90,000 76,500 109,000 110,000 87,000 142,000 156,000 196,000 215,000 2,763,000 332,000 266,000 10,454,000 313,250 588,000 380,000 285,000 343,250 965,000 293,000 115,000 419,500 465,000 587,000 626,000 587,750 776,000 790,000 785,000 508,750 733,000  
      income before income taxes
    20,855,000 26,752,000 25,330,000 -1,538,000 23,061,000 25,704,000 23,460,000 -1,403,000 19,705,000 24,672,000 23,657,000 954,000 16,429,000 23,914,000 24,644,000 316,000 14,872,000 19,502,000 22,356,000 -6,069,000 9,444,000 23,600,000 13,883,000 -4,331,000 15,388,000 30,930,000 17,995,000 -3,175,000 19,385,000 23,846,000 13,713,000 -12,177,000 13,466,000 21,444,000 16,495,000 -17,027,000 9,843,000 15,016,000 13,000,000 -12,274,000  13,698,000 -9,127,000 13,184,000 -64,351,000 11,387,000 -5,557,000 6,973,000 12,966,000 8,836,000 -3,873,000 8,563,000 8,603,000 5,631,000 -3,338,000 -2,352,000 6,272,000 4,345,000 6,890,000 4,334,000 5,147,000 3,385,000 -2,939,000 3,143,000 4,268,000 -10,676,000 -4,622,000  1,499,000 5,094,000 143,000        
      provision for income taxes
    4,459,000 6,133,000 6,876,000  6,261,000 6,076,000 6,759,000 -1,267,000 5,147,000 6,453,000 6,641,000 135,000 4,901,000 6,476,000 6,630,000 28,000 4,258,000 4,573,000 5,266,000  2,293,000 5,089,000 2,373,000  3,674,000 5,959,000 4,088,000  2,529,000 4,759,000 2,473,000  2,980,000 6,659,000 5,369,000  1,796,000 4,783,000 4,478,000   4,952,000  6,150,000 -26,533,000 4,104,000  1,412,000 3,972,000 2,950,000  2,774,000 2,791,000 1,888,000 -1,125,000 -2,261,000 858,000 896,000 1,344,000 1,259,000 1,461,000 1,107,000  950,000 1,323,000 -3,944,000 -1,448,000 983,000 849,000 1,844,000 52,000 1,859,000 3,412,000 2,830,000 1,011,000 2,755,000 3,142,000  
      net income
    16,396,000 20,619,000 18,454,000 -1,021,000 16,800,000 19,628,000 16,701,000 -136,000 14,558,000 18,219,000 17,016,000 819,000 11,528,000 17,438,000 18,014,000 288,000 10,614,000 14,929,000 17,090,000 -4,554,000 7,151,000 18,511,000 11,510,000 -3,407,000 11,714,000 24,971,000 13,907,000 -2,300,000 16,856,000 19,087,000 11,240,000 -9,123,000 10,486,000 14,785,000 11,126,000 -11,227,000 8,047,000 10,233,000 8,522,000 -8,003,000  8,746,000 -5,802,000 7,034,000 -37,818,000 7,283,000 -3,583,000 5,561,000 8,994,000 5,886,000 -2,549,000 5,789,000 5,812,000 3,743,000 -2,213,000 -91,000 5,414,000 3,449,000 5,546,000 3,075,000 3,686,000 2,278,000 -1,686,000 2,193,000 2,945,000 -6,732,000 -3,174,000 2,272,000 650,000 3,250,000 91,000 3,915,000 6,282,000 4,881,000 1,728,000 5,229,000 5,562,000  
      yoy
    -2.40% 5.05% 10.50% 650.74% 15.40% 7.73% -1.85% -116.61% 26.28% 4.48% -5.54% 184.38% 8.61% 16.81% 5.41% -106.32% 48.43% -19.35% 48.48% 33.67% -38.95% -25.87% -17.24% 48.13% -30.51% 30.83% 23.73% -74.79% 60.75% 29.10% 1.02% -18.74% 30.31% 44.48% 30.56% 40.28%  17.00% -246.88% -213.78%  20.09% 61.93% 26.49% -520.48% 23.73% 40.56% -3.94% 54.75% 57.25% 15.18% -6461.54% 7.35% 8.52% -139.90% -102.96% 46.88% 51.40% -428.94% 40.22% 25.16% -133.84% -46.88% -3.48% 353.08% -307.14% -3587.91% -41.97% -89.65% -33.42% -94.73% -25.13% 12.94%      
      qoq
    -20.48% 11.73% -1907.44% -106.08% -14.41% 17.53% -12380.15% -100.93% -20.09% 7.07% 1977.66% -92.90% -33.89% -3.20% 6154.86% -97.29% -28.90% -12.64% -475.27% -163.68% -61.37% 60.83% -437.83% -129.08% -53.09% 79.56% -704.65% -113.64% -11.69% 69.81% -223.21% -187.00% -29.08% 32.89% -199.10% -239.52% -21.36% 20.08% -206.49%   -250.74% -182.49% -118.60% -619.26% -303.27% -164.43% -38.17% 52.80% -330.91% -144.03% -0.40% 55.28% -269.14% 2331.87% -101.68% 56.97% -37.81% 80.36% -16.58% 61.81% -235.11% -176.88% -25.53% -143.75% 112.10% -239.70% 249.54% -80.00% 3471.43% -97.68% -37.68% 28.70% 182.47% -66.95% -5.99%   
      net income margin %
    5.11% 6.46% 6.00% -0.35% 5.51% 6.67% 5.97% -0.05% 5.26% 6.67% 6.43% 0.32% 4.24% 6.37% 6.87% 0.12% 4.14% 6.05% 7.33% -2.08% 3.07% 8.14% 5.73% -1.55% 4.78% 10.07% 6.02% -1.05% 7.09% 7.72% 4.85% -4.07% 4.28% 6.16% 4.93% -5.35% 3.64% 4.55% 4.19% -4.19% NaN% 4.80% -3.48% 6.10% -21.62% 4.82% -2.65% 5.73% 6.08% 4.57% -2.29% 8.01% 5.23% 3.92% -2.68% -0.16% 6.34% 4.54% 8.06% 6.16% 4.99% 3.38% -2.89% 5.05% 4.50% -11.76% -6.21% 4.21% 0.84% 4.50% 0.14% 7.55% 7.58% 7.64% 2.85% 10.87% 8.01%  
      basic income per common share
    650 800 720  650 750 640 -20 2,200 2,720 2,520 120 1,670 2,480 2,520 40 1,420 1,980 2,260  950 2,420 1,520  1,560 3,340 1,880  2,290 2,590 1,540  1,440 2,030 1,530         -1,190 -5,270                                  
      weighted-average number of basic common shares outstanding
    25,613,000 25,688,000 25,592,000 25,809,000 26,076,000 26,052,000 26,067,000 6,570,000 6,731,000 6,699,000 6,751,000 6,866,000 7,130,000 7,036,000 7,162,000 7,406,000 7,540,000 7,545,000 7,554,000 7,576,000 7,577,000 7,639,000 7,557,000 7,521,000 7,451,000 7,483,000 7,410,000 7,407,000 7,342,000 7,369,000 7,310,000 7,304,000 7,275,000 7,296,000 7,254,000 7,249,000 7,226,000 7,243,000 7,210,000 7,208,000 7,173,000 7,151,000 7,135,000  7,177,000 7,173,000 7,170,000  7,150,000 7,082,000 7,022,000  7,007,000 6,995,000 9,875,000                        
      diluted income per common share
    630 790 700  630 740 620 -20 2,150 2,680 2,470 120 1,630 2,450 2,480 40 1,410 1,960 2,240  930 2,400 1,510  1,510 3,240 1,810  2,210 2,500 1,460  1,380 1,960 1,470         -1,190 -5,270                                  
      weighted-average number of diluted common shares outstanding
    26,141,000 26,171,000 26,215,000 25,809,000 26,708,000 26,620,000 26,765,000 6,570,000 6,849,000 6,795,000 6,875,000 6,985,000 7,226,000 7,127,000 7,257,000 7,474,000 7,621,000 7,607,000 7,645,000 7,576,000 7,688,000 7,709,000 7,647,000 7,521,000 7,699,000 7,711,000 7,692,000 7,407,000 7,647,000 7,643,000 7,675,000 7,304,000 7,551,000 7,527,000 7,550,000 7,249,000 7,378,000 7,405,000 7,328,000 7,208,000 7,353,000 7,327,000 7,135,000  7,177,000 7,421,000 7,170,000  7,425,000 7,374,000 7,022,000  7,184,000 7,078,000 9,875,000                        
      benefit from income taxes
       -517,000                -1,515,000    -924,000    -875,000    -3,054,000    -5,800,000    -4,271,000   -3,325,000    -1,974,000    -1,324,000            -1,253,000                
      basic loss per common share
       -40                -600    -450    -310    -1,250    -1,550    -1,110   -810    -500    -360                            
      diluted loss per common share
       -40                -600    -450    -310    -1,250    -1,550    -1,110   -810    -500    -360                            
      professional employer service fees
                  232,174,000 217,433,000 223,528,000 217,972,000 208,496,000 193,819,000 204,268,000 199,082,000 180,488,000 193,592,000 212,033,000 214,156,000 203,157,000 190,527,000 200,840,000 206,320,000 197,277,000 188,961,000 200,731,000 197,388,000 187,718,000 172,209,000 176,242,000 177,229,000 165,776,000 154,678,000  140,048,000 127,751,000 129,703,000 126,456,000 112,503,000 101,689,000 107,407,000 106,244,000 93,494,000 81,818,000 79,806,000 74,874,000 65,113,000 56,212,000 53,386,000 50,795,000 45,495,000 40,437,000 40,808,000 39,922,000 35,457,000 31,198,000 31,698,000 32,314,000 29,263,000 27,030,000 30,956,000 32,993,000 31,579,000 30,375,000 36,283,000 38,997,000 34,139,000 32,573,000 34,055,000 35,917,000  
      cash dividends per common share
                               250 187.5 250 250 250 250 250 250 250 165 220 220 220  220 220 -539.24 180 180 180 -389.43 130 130 130                            
      loss on litigation
                                        -239,000 -3,305,000                                         
      workers’ compensation
                                        38,772,250 55,639,000 50,056,000 49,394,000  41,897,000 39,883,000 38,555,000 115,593,000 30,776,000 27,600,000 33,595,000 28,223,000 24,978,000 21,821,000 21,449,000 19,432,000 16,984,000 13,221,000 20,506,000 12,618,000 10,753,000 9,960,000 10,403,000 9,473,000 8,589,000 7,819,000 7,636,000 7,859,000 18,927,000 6,687,000 8,208,000 8,410,000 7,465,000 6,804,000 10,590,000 6,633,000 5,964,000 5,844,000 6,240,000 7,207,000  
      other expense
                                        -820,250 -3,280,000  -8,000                                       
      basic earnings per common share
                                        1,110 1,410 1,180   1,220    1,020  435 1,260 830  230 830 540 -220                        
      diluted earnings per common share
                                        1,090 1,380 1,160   1,190    980  417.5 1,210 800  227.5 810 530 -220                        
      dividends declared per common share
                                                       82.5 110 110                         
      life insurance proceeds
                                                              10,000,000                    
      basic earnings per share
                                                            0.54 0.34 0.54 0.3 0.36 0.22  0.21 0.28 -0.65 -0.3 0.22 0.06 0.3 0.01 0.35 0.56 0.43 0.15 0.47 0.49  
      weighted-average number of basic shares outstanding
                                               7,160    7,105    7,723    10,083 10,060 10,196 10,201 10,333 10,217 10,446 10,466 10,452 10,475 10,355 10,497 10,861 10,781 10,937 11,087 11,247 11,276 11,263 11,255  11,247  
      diluted earnings per share
                                                            0.54 0.34 0.54 0.3 0.36 0.22  0.21 0.28 -0.65 -0.3 0.2 0.06 0.29 0.01 0.34 0.54 0.42 0.15 0.45 0.48  
      weighted-average number of diluted shares outstanding
                                               7,160    7,397    7,863    10,150 10,100 10,245 10,248 10,372 10,251 10,485 10,466 10,452 10,559 10,355 10,497 11,120 10,997 11,221 11,423 11,654 11,691 11,690 11,681  11,659  
      basic loss per share
                                                                  -0.16                
      diluted loss per share
                                                                  -0.16                
      loss on impairment of investments
                                                                        -3,483,000          
      income before provision for income taxes
                                                                       1,684,000    5,036,000 9,694,000 7,711,000 2,739,000 4,376,500 8,704,000  
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-12-31 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 2020-12-31 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 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-01-01 
                                                                                    
        assets
                                                                                    
        current assets:
                                                                                    
        cash and cash equivalents
      95,033,000 47,676,000 26,348,000 31,977,000 55,367,000 14,429,000 40,348,000 51,267,000 71,168,000 41,579,000 48,347,000 52,635,000 91,423,000 58,951,000 34,098,000 46,074,000 69,405,000 12,860,000 2,469,000 28,545,000 68,688,000 61,193,000 62,210,000 14,272,000 44,570,000 35,452,000 23,693,000 38,223,000 35,371,000 34,975,000 33,786,000 24,000,000 59,835,000 35,570,000 17,865,000 18,429,000 50,768,000 26,786,000 422,000 43,464,000 25,218,000 4,439,000 15,205,000 11,544,000 51,985,000 47,869,000 66,268,000 93,557,000 34,978,000 8,847,000 48,015,000 45,747,000 22,181,000 36,358,000 38,217,000 49,571,000 42,217,000 25,472,000 27,798,000 30,924,000 18,261,000 17,444,000 28,094,000 36,671,000 38,505,000 27,137,000 45,139,000 42,214,000 28,302,000 16,640,000 54,906,000 62,779,000 57,638,000 71,025,000 69,707,000 69,874,000 60,083,000  
        investments
      62,154,000 62,076,000 64,097,000 67,160,000 66,492,000 79,934,000 70,100,000 72,410,000 81,027,000 87,653,000 84,658,000 80,088,000 68,325,000 73,185,000 77,303,000 81,334,000 96,763,000 102,709,000 107,284,000 114,142,000 101,244,000 86,679,000 67,473,000 79,373,000 82,590,000 101,748,000 77,271,000 569,000 416,000 395,000 464,000 472,000 674,000 796,000 965,000 973,000 5,675,000 1,013,000                                         
        trade accounts receivable
      248,626,000 300,616,000 264,175,000 261,291,000 234,533,000 253,749,000 211,565,000 200,368,000 171,407,000 205,217,000 198,055,000 188,013,000 163,838,000 194,537,000 266,870,000 256,296,000 155,707,000 240,293,000 226,582,000 207,430,000 118,506,000 212,362,000 188,383,000 165,790,000 163,561,000 187,467,000 163,228,000 154,157,000 151,597,000 162,574,000 152,560,000 147,058,000 136,664,000 156,368,000 147,141,000 139,277,000 126,484,000 140,074,000 177,927,000 163,831,000 90,529,000 137,862,000 130,376,000 102,627,000 129,761,000 104,008,000 95,956,000 85,586,000 98,717,000 80,852,000 70,292,000 63,921,000 71,018,000 63,433,000 53,175,000 46,520,000 50,870,000 59,738,000 54,774,000 37,596,000 56,483,000 50,301,000 44,517,000 33,070,000 46,194,000 41,466,000 36,379,000 34,389,000 47,866,000 45,296,000 41,204,000 36,673,000 45,339,000 36,906,000 35,420,000 31,328,000 35,265,000  
        income taxes receivable
      2,965,000 326,000  3,232,000 2,662,000 2,796,000 1,184,000 7,727,000 7,987,000         1,732,000 3,005,000 8,209,000 6,485,000 1,740,000 3,506,000 2,437,000 1,335,000      2,329,000 4,747,000 1,686,000   3,078,000    4,272,000 1,038,000 8,737,000 13,586,000 11,421,000 12,553,000  1,596,000  2,307,000 5,358,000 7,187,000  3,432,000 3,432,000 4,033,000 4,133,000 2,356,000 2,356,000 2,356,000 2,356,000 3,898,000 3,887,000 3,861,000 4,274,000 4,455,000 2,555,000             
        prepaid expenses and other
      18,652,000 25,806,000 25,769,000 29,502,000 18,698,000 18,768,000 17,459,000 18,513,000 18,443,000 17,136,000 17,625,000 20,605,000 19,787,000 20,167,000 20,358,000 19,239,000 17,606,000 23,418,000 18,437,000 14,613,000 15,961,000 13,883,000 17,377,000 16,511,000 14,919,000 15,974,000 15,720,000 16,632,000 13,880,000 12,444,000 9,824,000 9,002,000 5,724,000 6,605,000 8,582,000 6,830,000 3,899,000 3,637,000 4,818,000 5,768,000 3,173,000 5,689,000 6,658,000 3,813,000 4,966,000 5,283,000 4,621,000 3,026,000 1,444,000 2,985,000 4,036,000 4,854,000 1,536,000 2,914,000 4,509,000 5,897,000 1,808,000 2,426,000 3,319,000 1,798,000 1,772,000 2,265,000 2,550,000 979,000 1,365,000 2,796,000 2,740,000 1,440,000 1,776,000 1,994,000 3,816,000 2,336,000 1,903,000 2,109,000 2,551,000 1,940,000 3,106,000  
        restricted cash and investments
      97,210,000 80,403,000 91,042,000 138,490,000 97,690,000 83,009,000 80,818,000 125,010,000 97,470,000 75,876,000 68,970,000 108,165,000 110,989,000 113,942,000 111,905,000 113,427,000 67,238,000 82,273,000 104,640,000 99,183,000 96,991,000 90,608,000 82,567,000 120,054,000 116,873,000 107,702,000 108,275,000 127,076,000 120,409,000 112,385,000 108,196,000 104,939,000 103,652,000 90,681,000 87,516,000 51,078,000 48,557,000 51,959,000                                         
        total current assets
      524,640,000 516,903,000 471,431,000 531,652,000 475,442,000 452,685,000 421,474,000 475,295,000 447,502,000 427,461,000 417,655,000 449,506,000 454,362,000 460,782,000 510,534,000 516,370,000 406,719,000 463,285,000 462,417,000 472,122,000 407,875,000 466,465,000 421,516,000 398,437,000 423,848,000 448,343,000 388,187,000 336,657,000 321,673,000 322,773,000 307,159,000 290,218,000 308,235,000 290,020,000 262,069,000 219,665,000 260,625,000 244,375,000 252,446,000 278,302,000 227,009,000 219,859,000 215,791,000 178,929,000 251,254,000 198,137,000 208,390,000 210,885,000 216,670,000 175,512,000 156,667,000 139,418,000 119,685,000 126,308,000 123,264,000 128,957,000 129,062,000 130,509,000 128,671,000 103,286,000 108,912,000 102,094,000 99,542,000 93,056,000 102,626,000 91,074,000 98,684,000 98,609,000 103,299,000 97,524,000 104,858,000 106,868,000 111,947,000 118,072,000 116,467,000 111,225,000 107,140,000  
        property, equipment and software
      67,230,000 63,915,000 61,695,000 59,337,000 56,781,000 55,633,000 54,240,000 51,222,000 50,295,000 48,679,000 48,354,000 47,272,000 45,954,000 43,221,000 41,726,000 41,595,000 36,277,000 35,965,000 35,515,000 35,400,000 34,916,000 35,148,000 35,278,000 34,163,000 31,724,000 29,575,000 27,999,000 25,641,000 24,812,000 26,731,000 26,148,000 25,068,000 24,909,000 26,296,000 27,035,000 26,633,000 26,673,000 25,790,000 23,958,000 23,439,000 22,820,000 22,648,000 22,648,000 22,675,000 22,576,000 21,786,000 21,779,000 20,549,000 20,383,000 19,933,000 19,228,000 18,489,000 16,601,000 15,832,000 15,380,000 15,007,000 14,878,000 14,819,000 14,903,000 15,037,000 14,929,000 14,861,000 14,915,000 14,795,000 15,014,000 15,265,000 15,490,000 15,503,000 15,746,000 15,863,000 15,934,000 16,136,000 16,039,000 13,279,000 13,383,000 13,502,000 13,587,000  
        operating lease right-of-use assets
      23,218,000 23,973,000 24,343,000 22,028,000 20,329,000 20,595,000 20,278,000 20,719,000 19,898,000 18,428,000 19,818,000 19,273,000 19,804,000 20,919,000 18,601,000 18,367,000 20,697,000 22,058,000 23,208,000 23,475,000 23,025,000 23,730,000 24,985,000 25,730,000 23,805,000 23,784,000 25,005,000 24,922,000                                                   
        goodwill
      47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,820,000 47,338,000 47,338,000 47,338,000 47,338,000 47,338,000 47,338,000 45,316,000 45,315,000 41,508,000 39,859,000 28,036,000 28,036,000 27,536,000 26,536,000  
        other assets
      9,869,000 6,097,000 6,076,000 6,139,000 6,205,000 5,995,000 6,352,000 6,346,000 6,222,000 3,765,000 3,995,000 3,358,000 3,281,000 3,339,000 2,438,000 2,608,000 2,474,000 2,657,000 2,794,000 2,818,000 3,161,000 5,081,000 3,707,000 3,489,000 3,618,000 3,253,000 3,329,000 3,425,000 3,474,000 3,148,000 3,169,000 15,322,000 3,215,000 3,376,000 3,196,000 20,958,000 9,293,000 15,937,000 4,551,000 4,742,000 5,130,000 4,840,000 4,960,000 1,881,000 3,836,000 3,979,000 4,028,000 1,864,000 3,132,000 3,170,000 3,292,000 1,833,000 3,140,000 3,035,000 3,024,000 3,027,000 3,103,000 3,100,000 3,095,000 3,094,000 3,091,000 3,103,000 3,108,000 3,104,000 1,650,000 1,639,000 1,641,000 1,645,000 1,656,000 1,671,000 1,667,000 1,649,000 1,506,000 1,893,000 1,718,000 2,143,000 3,041,000  
        deferred income taxes
      74,000 1,896,000 2,562,000 3,288,000 4,477,000 2,206,000 4,806,000 4,789,000 4,218,000 12,236,000 10,819,000 10,044,000 11,440,000 10,497,000 7,096,000 3,775,000 1,687,000 2,946,000 3,328,000 2,511,000    3,325,000 2,788,000 5,523,000 5,897,000 7,061,000 8,458,000 8,158,000 7,762,000 7,389,000 5,834,000 9,241,000 9,292,000 9,384,000 25,242,000 20,906,000 20,908,000 20,918,000 20,941,000 15,774,000 15,763,000 15,791,000 17,229,000 8,944,000 8,936,000 8,929,000 8,172,000 8,177,000 8,150,000 8,148,000 5,943,000 5,931,000 7,458,000 5,958,000 5,873,000 5,810,000 5,795,000 6,101,000 4,271,000 4,283,000 5,265,000 4,071,000 2,963,000 3,781,000 2,373,000 2,373,000 2,163,000 3,271,000 3,249,000 3,138,000 4,251,000 4,182,000 4,719,000 4,699,000 6,153,000  
        total assets
      779,067,000 777,925,000 713,628,000 778,567,000 745,508,000 725,768,000 688,587,000 747,800,000 721,538,000 690,008,000 671,904,000 676,390,000 686,938,000                                                                  
        liabilities and stockholders' equity
                                                                                    
        current liabilities:
                                                                                    
        accounts payable
      7,433,000 5,842,000 4,933,000 7,634,000 6,787,000 4,222,000 4,396,000 5,697,000 6,593,000 5,268,000 5,701,000 5,384,000 8,264,000 4,553,000 4,321,000 4,332,000 4,485,000 4,483,000 4,606,000 5,611,000 4,746,000 6,447,000 4,951,000 4,333,000 5,993,000 5,432,000 4,824,000 5,357,000 4,336,000 4,464,000 3,951,000 3,884,000 5,166,000 4,033,000 4,945,000 3,509,000 4,944,000 4,520,000 4,458,000 3,940,000 3,217,000 2,419,000 3,500,000 2,719,000 2,839,000 2,435,000 2,382,000 3,252,000 2,721,000 2,810,000 2,482,000 1,995,000 2,135,000 1,913,000 1,982,000 1,639,000 1,306,000 694,000 567,000 964,000 1,042,000 702,000 494,000 1,117,000 648,000 876,000 1,206,000 881,000 1,207,000 1,212,000 929,000 1,516,000 968,000 1,327,000 1,842,000 1,545,000 1,323,000  
        accrued payroll and related benefits
      237,783,000 278,405,000 239,444,000 230,983,000 215,648,000                                                                          
        payroll taxes payable
      62,463,000 43,164,000 41,026,000 65,042,000 49,685,000                                                                          
        current operating lease liabilities
      6,969,000 6,945,000 6,682,000 6,521,000 6,231,000 6,304,000 6,245,000 6,345,000 6,623,000 6,753,000 6,882,000 7,029,000 6,957,000 6,908,000 6,716,000 6,603,000 7,191,000 7,435,000 7,748,000 8,006,000 7,539,000 7,303,000 7,244,000 7,046,000 6,671,000 6,448,000 6,381,000 6,299,000                                                   
        current premium payable
      38,992,000 20,208,000 39,805,000 80,543,000 31,134,000 12,778,000 16,134,000 65,820,000 35,276,000 18,853,000                                                                     
        other accrued liabilities
      19,357,000 17,873,000 11,066,000 9,600,000 10,330,000 10,453,000 10,496,000 7,516,000 9,412,000 6,904,000 22,785,000 29,314,000 31,603,000 27,461,000 18,873,000 15,958,000 15,120,000 8,190,000 65,415,000 8,292,000 7,275,000 6,603,000 6,553,000 7,043,000 8,846,000 13,244,000 15,908,000 17,054,000 20,566,000 8,860,000 8,944,000 8,124,000 9,024,000 7,407,000 7,891,000 6,523,000 7,674,000 10,751,000 4,419,000 6,558,000 6,166,000 1,896,000 1,784,000 1,917,000 1,144,000 1,081,000 411,000 313,000 953,000 636,000 468,000 306,000 355,000 350,000 767,000 300,000 602,000 806,000 487,000 442,000 370,000 649,000 564,000 499,000 557,000 453,000 675,000 902,000 919,000 713,000 647,000 1,064,000 1,037,000 937,000 752,000 516,000 908,000  
        workers' compensation claims liabilities
      32,875,000 34,239,000 35,368,000 37,438,000 39,081,000 42,291,000 44,929,000 46,555,000 50,006,000 53,622,000 55,941,000 58,233,000 62,917,000 65,537,000 69,130,000 75,893,000 80,028,000 78,225,000 86,047,000 103,290,000 102,040,000 96,583,000 89,868,000 117,894,000 118,273,000 113,623,000 108,289,000 111,156,000 109,319,000 103,527,000 102,539,000 99,861,000 97,673,000 89,601,000 88,431,000 85,481,000 81,339,000                                       3,843,000   
        total current liabilities
      405,872,000 406,676,000 378,648,000 437,761,000 358,896,000 344,879,000 332,830,000 387,994,000 343,252,000 341,109,000 335,818,000 338,388,000 334,731,000 341,755,000 389,768,000 391,903,000 315,396,000 356,974,000 406,848,000 369,806,000 290,637,000 345,987,000 316,010,000 343,393,000 342,122,000 367,789,000 347,575,000 359,905,000 326,738,000 342,819,000 329,891,000 330,189,000 322,255,000 317,869,000 294,728,000 297,767,000 275,164,000 284,031,000 299,011,000 308,317,000 237,393,000 257,589,000 262,763,000 218,270,000 199,877,000 163,555,000 165,511,000 146,464,000 154,969,000 129,555,000 129,035,000 111,276,000 112,509,000 98,052,000 97,244,000 79,318,000 77,573,000 82,260,000 81,774,000 58,723,000 69,471,000 63,929,000 61,873,000 47,031,000 58,024,000 56,297,000 54,177,000 46,116,000 56,979,000 52,232,000 52,617,000 48,300,000 53,137,000 49,192,000 51,519,000 47,020,000 46,492,000  
        long-term workers' compensation claims liabilities
      75,709,000 74,945,000 78,534,000 83,790,000 89,365,000 94,512,000 104,701,000 111,499,000 117,757,000 124,180,000 135,881,000 143,408,000 153,070,000 161,806,000 172,380,000 186,753,000 199,379,000 218,774,000 229,686,000 259,373,000 255,706,000 250,765,000 246,636,000 327,416,000 320,713,000 316,423,000 322,447,000 311,716,000 304,078,000 295,311,000 288,275,000 279,013,000 265,844,000 255,084,000 241,648,000 240,752,000 231,198,000                                       5,295,000   
        long-term premium payable
      26,025,000 25,212,000  16,354,000 49,840,000 44,621,000 27,127,000 33,435,000 37,812,000 23,301,000                                                                     
        long-term operating lease liabilities
      17,484,000 18,225,000 18,828,000 16,635,000 15,215,000 15,416,000 15,220,000 15,594,000 14,590,000 13,049,000 14,236,000 13,559,000 14,225,000 15,405,000 13,267,000 13,000,000 14,598,000 15,720,000 16,525,000 16,387,000 16,419,000 17,355,000 18,630,000 19,485,000 17,883,000 17,906,000 19,101,000 19,022,000                                                   
        customer deposits and other long-term liabilities
      12,977,000 12,722,000 11,801,000 10,676,000 10,788,000 10,954,000 9,748,000 9,689,000 8,987,000 7,923,000 8,000,000 7,557,000 7,070,000 6,661,000 6,361,000 7,149,000 7,362,000 6,920,000 6,910,000 6,638,000 5,925,000 5,348,000 4,869,000 4,342,000 4,682,000 4,106,000 3,773,000 3,489,000 2,285,000 1,276,000 1,353,000 1,363,000 1,381,000 1,389,000 1,297,000 1,353,000 1,441,000 1,443,000 1,399,000 1,392,000 1,483,000 1,487,000 1,534,000 1,675,000 1,888,000 1,967,000 1,799,000 1,862,000 1,789,000 1,470,000 1,779,000 1,786,000 1,655,000 1,502,000 1,484,000 1,497,000 1,459,000 1,393,000 1,438,000 1,422,000 1,451,000 1,488,000 1,506,000                
        total liabilities
      538,067,000 537,780,000 487,811,000 565,216,000 524,104,000 510,382,000 489,626,000 558,211,000 522,398,000 509,562,000 493,935,000 502,912,000 509,096,000 525,627,000 581,776,000 598,805,000 538,422,000 601,334,000 666,696,000 658,170,000 576,715,000 625,967,000 592,450,000 698,311,000 689,130,000 710,009,000 696,736,000 698,028,000 637,052,000 643,412,000 623,580,000 614,681,000 593,651,000 578,568,000 541,936,000 539,872,000 528,067,000 517,425,000 523,433,000 519,993,000 442,226,000                                      
        commitments and contingencies
                                                                                    
        stockholders' equity:
                                                                                    
        common stock, .01 par value...
      252,000 256,000 255,000 257,000 258,000 259,000 259,000 65,000 66,000 66,000 67,000 68,000 69,000 70,000 71,000 73,000 74,000 75,000 75,000 76,000 76,000 76,000 76,000 75,000 75,000 75,000 74,000 74,000 74,000 74,000 73,000 73,000 73,000 73,000 73,000 73,000 72,000 72,000 72,000 72,000 72,000 72,000 71,000 71,000 72,000 72,000 72,000 72,000 72,000 71,000 70,000 70,000 70,000 70,000 70,000 99,000 99,000 101,000 102,000 102,000 102,000 103,000 105,000 105,000 105,000 104,000 104,000 106,000 107,000 109,000 110,000 111,000 113,000 113,000   112,000  
        additional paid-in capital
      46,121,000 44,441,000 43,093,000 41,108,000 40,396,000 38,640,000 38,882,000 37,696,000 36,940,000 34,847,000 34,576,000 33,559,000 32,744,000 31,351,000 30,941,000 30,626,000 29,054,000 27,981,000 27,437,000 26,483,000 24,885,000 23,938,000 23,421,000 20,925,000 20,227,000 18,259,000 19,265,000 16,768,000 15,437,000 13,674,000 14,827,000 13,830,000 12,311,000 11,183,000 11,420,000 10,549,000 9,638,000 8,749,000 8,301,000 7,620,000 6,964,000 6,173,000 5,165,000 4,410,000 5,605,000 5,798,000 6,203,000 5,781,000 5,456,000 3,666,000 1,580,000 913,000 595,000 316,000  20,943,000 21,690,000 24,452,000 25,182,000 25,164,000 25,093,000 26,344,000 28,325,000 28,358,000 28,970,000 28,849,000 28,834,000 30,959,000 32,981,000 34,702,000 36,911,000 38,418,000 41,005,000 40,801,000 40,691,000 40,647,000 40,529,000  
        accumulated other comprehensive loss
      -11,487,000 -12,594,000 -14,265,000 -16,137,000 -19,245,000 -15,536,000 -22,340,000 -22,297,000 -20,801,000 -29,677,000 -25,970,000                 -1,411,000 -5,068,000 -7,406,000 -6,369,000 -5,394,000 -1,430,000   -23,000 -3,000    -31,000   -23,000 -18,000 -50,000 -37,000      -10,000   -34,000 -126,000 -30,000 -40,000                    
        retained earnings
      206,114,000 208,042,000 196,734,000 188,123,000 199,995,000 192,023,000 182,160,000 174,125,000 182,935,000 175,210,000 169,296,000 163,793,000 172,623,000 170,745,000 165,389,000 168,292,000 178,323,000 176,113,000 167,445,000 155,612,000 165,710,000 165,649,000 149,430,000 140,192,000 148,678,000 139,218,000 116,496,000 104,442,000 108,594,000 93,587,000 76,344,000 66,931,000 77,880,000 69,221,000 56,260,000 46,946,000 59,986,000 53,532,000 44,892,000 37,957,000 47,546,000 34,002,000 26,828,000 34,200,000 28,733,000 67,844,000 61,852,000 66,726,000 62,456,000 54,393,000 49,429,000 52,890,000 48,012,000 42,971,000 39,998,000 80,647,000 81,825,000 77,322,000 74,791,000 70,164,000 73,202,000 70,326,000 68,885,000 71,408,000 70,054,000 67,953,000 75,514,000 79,532,000 78,111,000 78,324,000 75,943,000 76,735,000 73,708,000 68,216,000 64,124,000 63,185,000 58,744,000  
        total stockholders' equity
      241,000,000 240,145,000 225,817,000 213,351,000 221,404,000 215,386,000 198,961,000 189,589,000 199,140,000 180,446,000 177,969,000 173,478,000 177,842,000 171,363,000 174,498,000 185,712,000 208,530,000 207,633,000 199,422,000 184,485,000 198,235,000 197,312,000 179,888,000 161,276,000 171,799,000 160,171,000 137,467,000 119,873,000 119,037,000 99,929,000 84,875,000 75,440,000 88,834,000 80,662,000                                             
        total liabilities and stockholders' equity
      779,067,000 777,925,000 713,628,000 778,567,000 745,508,000 725,768,000 688,587,000 747,800,000 721,538,000 690,008,000 671,904,000 676,390,000 686,938,000                                                                  
        income taxes payable
        324,000       786,000 4,491,000 722,000 610,000 2,572,000 5,214,000 1,896,000 1,673,000         3,408,000 2,670,000 3,560,000 4,403,000 2,429,000    6,781,000 174,000  3,041,000 4,797,000 71,000       2,322,000  1,236,000    272,000 2,969,000 193,000   1,517,000 498,000           475,000 527,000   890,000 847,000 216,000    
        accrued payroll, payroll taxes and related benefits
           268,831,000 250,630,000 256,061,000 234,080,000 247,454,000 238,388,000 235,922,000 222,331,000 232,219,000 282,754,000 283,937,000 199,067,000 249,713,000 235,928,000 233,132,000 149,989,000 205,476,000 181,406,000 180,526,000 174,168,000 197,686,000 181,966,000 189,330,000 158,683,000 194,718,000 186,172,000 190,738,000 181,639,000 182,267,000 166,982,000 173,493,000 153,110,000 161,062,000 186,295,000 188,110,000 121,343,000 144,227,000 154,508,000 120,133,000 133,484,000 105,710,000 112,000,000 92,516,000 107,060,000 86,835,000 89,493,000 69,568,000 77,533,000 68,385,000 68,889,000 52,340,000 52,689,000 60,355,000 61,084,000 37,525,000 52,288,000 47,853,000 46,256,000 30,244,000 42,134,000 38,851,000 39,665,000 32,296,000 41,323,000 37,855,000 38,716,000 33,553,000 38,262,000 34,788,000 38,133,000 33,372,000 31,910,000  
        safety incentives liability
              1,262,000 1,469,000 1,630,000 1,784,000 2,049,000 2,505,000 2,760,000 3,284,000 4,322,000 5,363,000 6,883,000 11,254,000 18,827,000 23,354,000 25,767,000 26,330,000 27,950,000 27,727,000 27,316,000 26,928,000 29,210,000 28,600,000 28,064,000 27,361,000 28,532,000 27,559,000 26,084,000 24,204,000 24,835,000 24,997,000 24,262,000 21,816,000 21,253,000 18,147,000 15,499,000 14,232,000 14,063,000 12,718,000 12,192,000 13,086,000 11,947,000 10,939,000 10,288,000 9,842,000 8,678,000 7,541,000 6,979,000 6,321,000 5,860,000 5,057,000 4,940,000 5,024,000 4,753,000 4,241,000 4,159,000 4,437,000 4,588,000 4,593,000 4,515,000 4,626,000 4,895,000 4,663,000 5,637,000 5,911,000 8,065,000 7,815,000 7,447,000 7,519,000 7,534,000  
        accumulated other comprehensive expense
                 -23,942,000                                                                   
        current portion of long-term debt
                      3,510,000 3,565,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 221,000 4,557,000 221,000 221,000 7,721,000 19,778,000 19,833,000 27,220,000 25,220,000 25,220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000 220,000                           
        accumulated other comprehensive income
                  -27,594,000 -30,803,000 -21,903,000 -13,279,000 1,079,000 3,464,000 4,465,000 2,314,000 7,564,000 7,649,000 6,961,000 84,000 2,819,000 2,619,000 1,632,000       185,000 110,000   27,000 23,000 3,000  4,000 21,000     -26,000 -16,000 -24,000 19,000 23,000  9,000 7,000     -65,000 176,000 159,000 346,000 256,000               
        long-term debt
                        3,399,000 3,455,000 3,510,000 3,565,000 3,620,000 3,675,000 3,730,000 3,785,000 3,840,000 3,896,000 3,951,000 4,006,000 4,061,000 4,116,000 4,171,000 4,226,000 4,263,000  4,392,000 4,447,000 4,502,000   14,723,000 19,778,000 19,833,000 4,888,000 4,943,000 4,998,000 5,053,000 5,108,000 5,163,000 5,219,000 5,273,000                           
        liabilities and stockholders’ equity
                                                                                    
        workers’ compensation claims liabilities
                                           77,683,000 71,785,000 68,115,000 65,581,000 60,457,000 56,480,000 54,049,000 48,127,000 39,069,000 38,306,000 35,841,000 32,068,000 28,115,000 26,084,000 24,541,000 20,839,000 19,670,000 18,627,000 18,718,000 15,599,000 14,850,000 14,696,000 14,768,000 11,018,000 10,484,000 10,400,000 10,509,000 9,872,000 11,299,000 7,891,000 7,186,000 7,935,000 7,037,000 6,463,000 6,031,000 3,690,000 3,253,000 2,904,000  4,575,000  
        long-term workers’ compensation claims liabilities
                                           214,248,000 205,265,000 197,028,000 190,094,000 169,154,000 165,785,000 161,933,000 160,216,000 83,437,000 81,829,000 76,603,000 63,912,000 56,428,000 51,128,000 45,266,000 39,931,000 35,231,000 32,294,000 30,596,000 25,100,000 23,504,000 22,423,000 21,847,000 16,351,000 16,106,000 15,493,000 14,560,000 15,377,000 13,667,000 5,227,000 5,235,000 4,918,000 4,926,000 4,013,000 4,021,000 3,020,000 3,976,000 5,288,000  7,791,000  
        stockholders’ equity:
                                                                                    
        restricted certificates of deposit
                                            10,000,000 10,000,000 10,000,000 26,015,000 114,335,000 114,335,000 20,943,000 20,943,000 12,789,000 12,789,000 63,944,000 63,944,000                             
        restricted marketable securities and workers’ compensation deposits
                                            48,371,000 40,049,000 76,110,000 21,343,000 12,533,000 3,776,000 43,821,000 34,696,000 31,133,000 11,205,000 10,472,000 10,505,000 10,583,000 9,726,000 9,967,000 9,932,000 9,885,000 9,923,000 9,745,000 9,430,000 9,001,000 8,811,000 9,305,000 8,933,000 8,896,000 2,666,000 3,454,000 3,283,000 3,132,000 2,701,000 3,821,000 3,896,000 3,198,000  3,096,000 2,656,000 2,703,000  2,492,000  
        marketable securities
                                            2,362,000 895,000 6,082,000 6,048,000 21,670,000 29,957,000 34,760,000 32,033,000 31,013,000 19,787,000 7,108,000 5,349,000 18,987,000 16,748,000 15,575,000 14,240,000 15,872,000 16,878,000 25,938,000 34,707,000 34,629,000 24,511,000 24,227,000 23,914,000 15,255,000 13,766,000 8,919,000 13,114,000 11,828,000 17,968,000 22,967,000 30,098,000 1,458,000 1,717,000 2,591,000 3,625,000 3,845,000 3,159,000 2,291,000  
        stockholders’ equity: - sum
                                             45,652,000   32,085,000   73,664,000         40,075,000 101,655,000 103,488,000 101,845,000 100,035,000 95,365,000 98,573,000 96,932,000      110,622,000       104,653,000    
        line of credit
                                               3,223,000 5,772,000         4,532,000                           
        workers’ compensation receivables for insured losses and recoveries
                                                 3,425,000    2,301,000    1,676,000 1,568,000 1,601,000 2,720,000 2,968,000 3,740,000 3,800,000 3,837,000 3,915,000 3,610,000 3,639,000 3,675,000 3,640,000 3,552,000 3,626,000 3,675,000 3,837,000           
        preferred stock, .01 par value...
                                                                                    
        long-term workers’ compensation claims liabilities for insured claims
                                                         757,000 858,000 864,000 1,873,000 1,879,000 2,636,000 2,642,000 2,664,000 2,686,000 2,665,000 2,684,000 2,702,000 2,504,000 2,350,000 2,366,000 2,396,000 2,438,000 2,317,000 2,372,000 2,417,000 2,464,000 2,906,000 2,931,000 2,962,000  2,709,000  
        mandatorily redeemable preferred stock, .01 par value...
                                                           34,800,000 34,800,000                        
        workers’ compensation receivables for insured claims
                                                                     225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000  242,000  
        workers’ compensation claims liabilities for insured claims
                                                                     225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000 225,000  242,000  
        customer deposits
                                                                     600,000 614,000 626,000 648,000 706,000 698,000 687,000 724,000 752,000 711,000 689,000 685,000 817,000 783,000  
        other long-term liabilities
                                                                     500,000               
        deferred gain on sale and leaseback
                                                                     427,000 457,000 488,000 518,000 549,000 579,000 610,000 640,000 671,000 701,000 732,000 762,000 793,000 823,000  
        other comprehensive income
                                                                      161,000 113,000 25,000 25,000           
        other comprehensive loss
                                                                          -39,000 -1,716,000 -1,683,000 -1,516,000 -1,024,000 -395,000 -275,000 -244,000 -171,000  
        restricted marketable securities and workers' compensation deposits
                                                                             2,750,000    2,616,000   
        workers' compensation receivables for insured claims
                                                                             3,896,000    225,000   
        intangibles
                                                                              111,000 62,000 69,000 75,000 82,000  
        no shares issued and outstanding
                                                                                    
        and 11,253 shares issued and outstanding
                                                                                113,000    
        workers' compensation claims liabilities for insured claims
                                                                                 225,000   
        long-term workers' compensation claims liabilities for insured claims
                                                                                 3,011,000   
        issued and outstanding
                                                                                    
        and 11,047 shares issued and outstanding
                                                                                 112,000   
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 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 2020-12-31 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 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 
                                                                                   
          cash flows from operating activities:
                                                                                   
          net income
        16,396,000 20,619,000   16,800,000 19,628,000 16,701,000 -136,000 14,558,000 18,219,000 17,016,000 819,000 11,528,000 17,438,000 18,014,000 288,000 10,614,000 14,929,000   7,151,000 18,511,000   11,714,000 24,971,000   16,856,000 19,089,000   10,486,000 14,785,000   8,047,000 10,233,000     7,034,000 -37,818,000   5,561,000 8,994,000   5,789,000 5,812,000 3,743,000 -2,213,000 -91,000 5,414,000 3,449,000 5,546,000 3,075,000 3,686,000   2,193,000 2,945,000 -6,732,000 -3,174,000 2,272,000 650,000 3,250,000 91,000 3,915,000 6,282,000 4,881,000 1,728,000 5,229,000 
          reconciliations of net income to net cash from operating activities:
                                                                                   
          depreciation and amortization
        2,163,000 2,097,000 2,038,000 1,958,000 1,938,000 1,899,000 1,912,000 1,852,000 1,837,000 1,867,000 1,729,000 1,677,000 1,643,000 1,554,000 1,523,000 1,508,000 1,359,000 1,342,000 1,328,000 1,297,000 1,332,000 1,341,000 1,171,000 1,000,000 977,000 970,000 970,000 969,000 991,000 950,000 1,274,000 1,004,000 2,463,000 1,062,000 985,000 942,000 912,000 823,000 769,000 749,000 709,000 683,000 663,000 646,000 613,000 584,000 550,000 521,000 506,000 460,000 401,000 372,000 356,000 348,000 344,000 334,000 331,000 335,000 344,000 341,000 333,000 377,000 423,000 422,000 410,000 386,000 393,000 385,000 382,000 376,000 372,000 350,000 316,000 349,000 341,000 
          non-cash operating lease expense
        1,782,000 1,760,000 1,686,000 1,618,000                                                                        
          investment amortization and losses recognized
                853,000 75,000 231,000 237,000 944,000 315,000 264,000 336,000 380,000 382,000 468,000 203,000 244,000 60,000 202,000 81,000 177,000                                                   
          losses recognized on disposal of property and equipment
                                                                                   
          deferred income taxes
        1,470,000 -1,000 23,000            25,000 -346,000    1,602,000 3,382,000 508,000                  56,000 4,622,000 -13,684,000 -16,000 -409,000 -584,000 10,000 -54,000 -4,000 271,000 -23,000 1,527,000 -1,474,000 287,000 -126,000 1,000 291,000 894,000 1,105,000 -1,253,000 1,242,000 1,752,000 -1,463,000 -1,448,000 874,000 1,000 1,000 1,000 1,741,000 863,000 1,543,000 -20,000 3,140,000 
          share-based compensation
        2,569,000 2,868,000 2,265,000 2,658,000 2,192,000 2,355,000 2,106,000 2,187,000 2,438,000 2,136,000 1,963,000 1,928,000 1,901,000 1,893,000 1,766,000 1,830,000 1,492,000 1,479,000 1,335,000 1,060,000 1,152,000 1,145,000 797,000 342,000 1,672,000 1,673,000 2,441,000 1,387,000 1,510,000 1,409,000 1,041,000 1,542,000 1,120,000 1,292,000 890,000 882,000 901,000 841,000 681,000 359,000 524,000 545,000  515,000 340,000 331,000  235,000 184,000 183,000                          
          changes in certain operating assets and liabilities:
                                                                                   
          trade accounts receivable
        51,990,000 -36,441,000 -2,884,000 -26,758,000 19,216,000 -42,184,000 -11,197,000 -28,961,000 33,810,000 -7,162,000 -10,042,000 -24,175,000 30,699,000 72,333,000 -10,574,000 -100,589,000 84,586,000 -13,711,000 -19,152,000 -88,924,000 93,856,000 -23,979,000 -22,593,000 -2,229,000 23,906,000 -24,239,000 -9,071,000 -2,560,000 10,977,000 -10,014,000 -5,502,000 -10,394,000 19,704,000 -9,227,000 -7,864,000 -12,793,000 13,590,000 37,853,000 -14,096,000 -73,302,000 -7,486,000 -27,749,000 27,134,000 -25,753,000 -8,052,000 -10,370,000 13,131,000 -17,865,000 -10,560,000 -6,371,000 7,097,000 -7,585,000 -10,258,000 -6,655,000 4,350,000 8,868,000 -4,964,000 -17,178,000 18,887,000 -6,182,000 -5,784,000 -11,447,000 13,124,000 -4,728,000 -5,087,000 -1,990,000 13,477,000 -2,570,000 -4,092,000 -4,531,000 8,666,000 -8,433,000 -1,486,000 -4,092,000 3,937,000 
          income taxes
        -2,639,000 -650,000 3,556,000 -570,000 134,000 -1,612,000 6,543,000 260,000 -8,773,000 -3,705,000 3,769,000 112,000 -1,962,000 -2,642,000 3,318,000 223,000 3,405,000 1,273,000 5,204,000 -1,724,000 -4,745,000 1,766,000 -1,069,000 -1,102,000                                                    
          prepaid expenses and other
        7,154,000 -37,000 3,733,000 -10,804,000 70,000 -1,309,000 1,054,000 -70,000 -1,307,000 489,000 2,980,000 -818,000 380,000 191,000 -1,119,000 -1,633,000 5,812,000 -4,981,000 -3,824,000 1,348,000 -2,078,000 3,494,000 -866,000 -1,592,000 1,055,000 -254,000 912,000 -2,752,000 -1,436,000 -2,620,000 -822,000 -3,278,000 881,000 1,977,000 -1,752,000 -2,931,000 -262,000 1,181,000 950,000 -2,595,000 969,000 -2,845,000 1,553,000 317,000 -662,000 -1,595,000 -1,582,000 1,541,000 1,051,000 818,000 -3,318,000 1,378,000 1,595,000 1,388,000 -4,089,000 618,000 893,000 -1,521,000 -26,000 493,000 285,000 -1,571,000 386,000 1,431,000 -56,000 -1,300,000 336,000 218,000 1,822,000 -1,480,000 -433,000 206,000 442,000 -611,000 1,166,000 
          accounts payable
        1,591,000 909,000 -2,701,000 847,000 2,565,000 -174,000 -1,301,000 -896,000 1,325,000 -433,000 317,000 -2,880,000 3,711,000 232,000 -11,000 -153,000 2,000 -123,000 -1,005,000 865,000 -1,701,000 1,496,000 618,000 -1,660,000 561,000 608,000 -533,000 1,021,000 -128,000 513,000 67,000 -1,282,000 1,133,000 -912,000 1,436,000 -1,435,000 424,000 62,000 518,000 723,000 -1,081,000 781,000 -120,000 404,000 53,000 -870,000 531,000 -89,000 328,000 487,000 -140,000 222,000 -69,000 343,000 333,000 612,000 127,000 -397,000 -78,000 340,000 208,000 -623,000 469,000 -228,000 -330,000 325,000 -326,000 -5,000 283,000 -587,000 548,000 -359,000 -515,000 297,000 222,000 
          accrued payroll and related benefits
        -40,353,000 38,718,000 8,562,000 15,670,000                                                                        
          payroll taxes payable
        19,299,000 2,138,000 -24,016,000 15,357,000                                                                        
          other accrued liabilities
        1,460,000 6,955,000 1,311,000 -941,000 -491,000 189,000 2,701,000 -3,135,000 2,477,000 3,069,000 -6,564,000 -2,372,000 3,978,000 8,667,000 3,030,000 50,000 6,918,000 -57,216,000 57,087,000 964,000 1,027,000 61,000 -664,000 -2,095,000 -4,398,000 -2,664,000 -1,146,000 -3,512,000 13,322,000 -692,000 820,000 -900,000 1,617,000 -484,000 1,368,000 -1,151,000 -3,077,000 6,332,000 -2,139,000 392,000 112,000 -133,000 773,000 63,000 670,000 98,000 -640,000 317,000 168,000 162,000 -49,000 5,000 -417,000 467,000 -302,000 -204,000 319,000 45,000 72,000 -279,000 85,000 -60,000 -58,000 104,000 -222,000 -227,000 -17,000 206,000 66,000 -417,000 27,000 100,000 185,000 236,000 -392,000 
          premium payable
        19,597,000 5,615,000 -57,092,000 15,923,000 23,575,000 14,138,000 -55,994,000 26,167,000 30,934,000                                                                   
          workers' compensation claims liabilities
        -4,401,000 -4,708,000 -7,297,000 -7,152,000 -8,615,000 -12,470,000 -8,430,000 -9,835,000 -12,553,000 -13,791,000 -10,490,000 -14,412,000 -11,285,000 -15,066,000 -20,977,000 -16,894,000 -17,410,000 -18,596,000 -46,907,000 5,273,000 12,314,000 9,475,000 -109,024,000 6,452,000 8,620,000 -613,000 7,962,000 9,508,000 14,241,000 8,050,000 11,963,000 15,378,000 18,977,000 14,487,000 9,980,000 13,696,000                                        
          operating lease liabilities
        -1,744,000 -1,730,000 -1,647,000 -1,607,000 -1,602,000 -1,630,000 -1,630,000 -1,806,000 -1,825,000 -1,682,000 -1,773,000 -1,819,000 -1,735,000 -1,725,000 -1,555,000 -1,725,000 -2,113,000 -1,968,000 -1,918,000 -1,887,000 -1,847,000 -1,810,000 -1,733,000 -1,672,000 -1,569,000 -1,641,000 -1,658,000 -1,374,000                                                
          other assets and liabilities
        -292,000 79,000 50,000 24,000 21,000 228,000 -20,000 -11,000 81,000 -9,000 15,000 -247,000 -21,000 387,000 64,000 -132,000 18,000 18,000 7,000 -30,000 -98,000 13,000 -48,000 -95,000 -82,000 29,000 -1,174,000 1,220,000                                                
          net cash from operating activities
        76,132,000 38,428,000 -53,816,000 5,211,000 53,375,000 -935,000 -51,332,000 8,979,000 57,223,000 33,196,000 3,318,000 -26,515,000 30,837,000 34,357,000 -7,207,000 -30,209,000 44,845,000 -62,925,000 10,505,000 -7,884,000 50,946,000 35,528,000 -115,430,000 1,041,000 19,612,000 18,660,000 8,093,000 30,772,000 22,882,000 30,441,000 18,629,000 -2,168,000 52,332,000 46,377,000   23,015,000 52,821,000 12,288,000 -7,817,000 7,071,000 5,503,000 36,079,000 24,836,000 971,000 7,710,000 23,024,000 29,742,000 4,474,000 12,956,000 13,210,000 19,388,000 1,571,000 11,488,000 6,580,000 12,273,000 1,379,000 11,123,000 12,407,000 3,955,000 803,000 781,000 4,749,000 2,564,000 -4,995,000 707,000 6,508,000 6,922,000 1,788,000 -1,052,000 10,398,000 2,620,000 2,156,000 2,117,000 12,766,000 
          capital expenditures
        -5,496,000 -4,355,000 -4,412,000 -4,514,000 -3,159,000 -3,292,000 -4,930,000 -2,779,000 -3,712,000 -2,309,000 -2,811,000 -2,995,000 -4,515,000 -3,050,000 -1,654,000 -6,754,000 -1,785,000 -1,792,000 -1,443,000 -1,781,000 -1,674,000 -1,211,000 -2,286,000 -3,439,000 -2,545,000 -3,329,000 -1,798,000 -1,237,000 -925,000 -2,354,000 -1,163,000 -1,075,000 -323,000   -2,655,000 -1,288,000 -1,368,000 -709,000 -656,000 -762,000 -1,436,000 -620,000 -1,814,000 -716,000 -971,000 -1,211,000 -1,199,000 -1,139,000 -720,000 -411,000 -391,000 -246,000 -199,000 -448,000 -404,000 -270,000 -484,000 -191,000 -158,000 -173,000 -359,000 -253,000 -296,000 -145,000 -205,000 -224,000 -249,000 
          free cash flows
        70,636,000 34,073,000 -58,228,000 697,000 50,216,000 -4,227,000 -56,262,000 6,200,000 53,511,000 30,887,000 507,000 -29,510,000 26,322,000 31,307,000 -8,861,000 -36,963,000 43,060,000 -64,717,000 9,062,000 -9,665,000 49,272,000 34,317,000 -117,716,000 -2,398,000 19,612,000 16,115,000 4,764,000 28,974,000 21,645,000 29,516,000 16,275,000 -3,331,000 51,257,000 46,054,000   23,015,000 50,166,000 11,000,000 -9,185,000 6,362,000 4,847,000 35,317,000 23,400,000 351,000 5,896,000 22,308,000 28,771,000 3,263,000 11,757,000 13,210,000 18,249,000 1,571,000 10,768,000 6,169,000 11,882,000 1,133,000 10,924,000 11,959,000 3,551,000 533,000 297,000 4,558,000 2,406,000 -5,168,000 348,000 6,508,000 6,669,000 1,492,000 -1,197,000 10,398,000 2,620,000 1,951,000 1,893,000 12,517,000 
          cash flows from investing activities:
                                                                                   
          purchase of property, equipment and software
        -5,496,000 -4,355,000 -4,412,000 -4,514,000 -3,159,000 -3,292,000 -4,930,000 -2,779,000 -3,712,000 -2,309,000 -2,811,000 -2,995,000 -4,515,000 -3,050,000 -1,654,000 -6,754,000 -1,785,000 -1,792,000 -1,443,000 -1,781,000 -1,674,000 -1,211,000 -2,286,000 -3,439,000                                                    
          proceeds from sale of property and equipment
                                                                                   
          purchase of investments
        1,000 -2,201,000 -5,468,000    -1,000 -4,198,000       1,940,000 -14,764,000 -18,567,000 -23,444,000 -15,409,000 -26,607,000 -23,722,000 -53,685,000 -541,000 -109,000 -8,000 -258,000 -287,000 -628,000 -773,000 -2,724,000 -1,319,000 -1,749,000 -491,000 10,000                                       
          proceeds from sales and maturities of investments
        268,000 2,576,000 7,454,000 5,685,000 12,448,000 264,000 2,317,000 8,290,000 9,547,000 291,000 281,000 233,000 5,904,000 1,465,000 567,000 10,796,000 3,126,000 32,076,000 30,673,000 9,381,000 1,131,000 8,244,000 16,789,000 21,758,000 72,830,000 679,000 15,247,000 15,000 404,000 112,000 780,000 589,000 2,829,000 887,000 1,500,000 5,502,000 292,000                                       
          purchase of restricted investments
        -622,000 -602,000 -1,421,000 -33,705,000 -2,429,000 -19,892,000 -3,001,000 -4,649,000 -45,791,000 -9,489,000 -9,729,000 -1,725,000 -701,000 -582,000 -790,000 -2,272,000 -3,000 -730,000 -120,260,000 -132,788,000 -2,460,000 -2,938,000 -27,742,000 -1,828,000 -5,866,000 -701,000 -1,222,000 -2,023,000 -4,878,000 -473,000 -22,099,000 -81,289,000                                            
          proceeds from sales and maturities of restricted investments
        9,227,000 3,647,000 58,675,000 6,024,000 2,895,000 2,838,000 48,505,000 13,253,000 2,314,000 4,404,000 8,125,000 2,446,000 17,994,000 5,256,000 20,755,000 18,735,000 17,167,000 63,441,000 22,404,000 24,286,000 20,375,000 22,707,000 8,004,000 14,449,000 10,086,000 7,644,000 3,906,000 30,859,000 19,831,000 22,070,000 11,458,000 21,291,000                                            
          net cash from investing activities
        3,378,000 1,266,000 58,095,000 -31,978,000 9,763,000 -27,984,000 42,891,000 14,115,000 -37,640,000 -11,184,000 -4,322,000 -2,041,000 18,682,000 3,089,000 18,878,000 20,505,000 20,445,000 78,231,000 -87,193,000 -124,346,000 1,963,000 195,000 -5,235,000 7,218,000 20,239,000 4,536,000 14,493,000 27,045,000 14,347,000 20,497,000 -12,843,000 -61,345,000 -26,193,000 -25,282,000 -13,669,000 -29,641,000 2,627,000 -16,916,000 -46,188,000 27,407,000 -11,146,000 -6,199,000 -112,788,000 -18,664,000 -17,279,000 -33,744,000 36,990,000 -4,181,000 -44,567,000 -5,674,000 1,129,000 1,932,000 -2,831,000 1,906,000 2,749,000 8,287,000 -1,919,000 -13,293,000 1,158,000 -1,023,000 -8,581,000 -8,456,000 -5,108,000 9,390,000 -12,168,000 5,214,000 10,278,000 7,326,000 16,027,000 -4,430,000 -1,780,000 -15,422,000 -158,000 -1,540,000 -2,305,000 
          cash flows from financing activities:
                                                                                   
          proceeds from credit-line borrowings
                                 3,568,000 11,300,000 16,683,000 28,251,000 2,511,000   54,607,000 78,057,000 38,043,000            323,000 627,000 939,000 4,101,000 1,480,000 323,000 4,879,000 
          payments on credit-line borrowings
                                 -3,568,000 -11,300,000 -19,232,000 -22,479,000 -2,511,000   -54,607,000 -82,589,000 -33,511,000            -323,000 -627,000 -939,000 -4,101,000 -1,480,000 -323,000 -4,879,000 
          repurchase of common stock
                    -8,116,000 -10,560,000 -19,917,000 -8,575,000 -6,512,000 -4,197,000 -3,142,000 -3,436,000 -5,069,000 -2,987,000                   -2,026,000 -659,000       -25,432,000 -951,000 -2,904,000 -868,000 -55,000 -1,315,000 -2,035,000 -65,000 -642,000 -176,000 -20,000 -2,174,000 -2,027,000 -2,450,000 -2,458,000 -1,539,000      
          common stock repurchased on vesting of restricted stock units and performance awards
        -64,000 -3,625,000 -70,000 -2,272,000                                                                        
          dividends paid
        -2,020,000 -2,055,000 -2,048,000 -2,059,000 -2,075,000 -2,086,000 -1,955,000 -1,970,000 -1,984,000 -2,025,000 -2,013,000 -2,067,000 -1,972,000 -2,128,000 -2,195,000 -2,229,000 -2,251,000 -2,269,000 -2,271,000 -2,278,000 -2,295,000 -2,292,000 -2,272,000 -2,262,000 -2,254,000 -2,249,000 -1,853,000 -1,852,000 -1,849,000 -1,846,000 -1,827,000 -1,826,000 -1,827,000 -1,824,000 -1,812,000 -1,813,000 -1,593,000 -1,593,000 -1,587,000 -1,586,000 -1,572,000 -1,570,000 -1,568,000 -1,293,000 -1,291,000 -1,291,000 -1,291,000 -931,000 -922,000 -912,000 -911,000 -771,000 -770,000 -1,098,000 -1,087,000 -911,000 -918,000 -919,000 -918,000 -810,000 -837,000 -837,000 -839,000 -844,000 -829,000 -844,000 -851,000 -863,000 -869,000 -883,000 -888,000 -791,000 -788,000 -789,000  
          proceeds from exercise of stock options and purchase of espp
              7,000 376,000                                                                   
          net cash from financing activities
        -19,217,000 -10,830,000 -10,125,000 -12,798,000 -9,265,000 -12,362,000 -9,392,000 -10,106,000 -7,178,000 -14,171,000 -12,460,000 -10,763,000 -10,159,000 -13,566,000 -22,370,000 -14,088,000 -8,879,000 -7,251,000 -5,695,000 -5,061,000 -7,350,000 -2,975,000 -627,000 -4,778,000 -2,013,000 -4,982,000 -1,853,000 -1,963,000 -1,651,000 -4,462,000 -1,926,000 -1,904,000 -1,874,000 -3,390,000 -1,903,000 -1,840,000 -1,660,000 -9,541,000 -9,142,000 -1,344,000 -6,691,000 4,357,000 36,268,000 -2,056,000 -2,091,000 -1,255,000 -1,435,000 570,000 925,000 -5,014,000 9,227,000 -35,497,000 -599,000 -24,748,000 -1,975,000 -3,815,000 -1,786,000 -956,000 -902,000 -2,115,000 -2,872,000 -902,000 -1,475,000 -586,000 -839,000 -2,996,000 -2,874,000 -2,586,000 -3,079,000 -2,391,000 -3,477,000 -585,000 -680,000 -744,000 -670,000 
          net increase in cash, cash equivalents and restricted cash
           -39,565,000    12,988,000            -137,291,000 45,559,000 32,748,000 -121,292,000 3,481,000 37,838,000 18,214,000 20,733,000 55,854,000                                                
          cash, cash equivalents and restricted cash, beginning of period
        82,588,000 74,841,000 107,378,000 78,629,000 233,837,000 273,341,000 140,702,000 120,205,000                                            
          cash, cash equivalents and restricted cash, end of period
        60,293,000 28,864,000 -5,846,000 43,023,000 53,873,000 -41,281,000 -17,833,000 87,829,000 12,405,000 7,841,000 -13,464,000 68,059,000 39,360,000 23,880,000 -10,699,000 54,837,000 56,411,000 8,055,000 -82,383,000 96,546,000 45,559,000 32,748,000 -121,292,000 276,822,000 37,838,000 18,214,000 20,733,000 196,556,000 35,578,000 46,476,000 3,860,000 54,788,000                                            
          reconciliations of net income to net cash used in operating activities:
                                                                                   
          net investment amortization and losses recognized
         198,000    189,000                                                                      
          losses recognized on disposal of property
                                                                                   
          repurchases of common stock
         -7,535,000 -8,130,000 -9,160,000  -8,022,000 -7,047,000 -7,056,000  -10,917,000 -10,145,000 -8,030,000                                                                
          proceeds from exercise of stock options and purchase of espp shares
         2,385,000 123,000 693,000                                                                        
          net decrease in cash, cash equivalents and restricted cash
         28,864,000    -41,281,000    7,841,000 -13,464,000 -39,319,000  23,880,000 -10,699,000 -23,792,000  8,055,000            46,476,000 3,860,000 -65,417,000                                            
          losses recognized on sale of property
                                                                                   
          net loss
           -1,021,000                -4,554,000    -3,407,000    -2,300,000    -9,123,000    -11,227,000    -8,003,000  -5,802,000    -3,583,000    -2,549,000            -1,686,000              
          reconciliations of net loss to net cash provided by operating activities:
                                                                                   
          net investment amortization
           -14,000    -396,000                                                                    
          payments on long-term debt
                    -3,510,000 -55,000 -55,000 -56,000 -55,000 -55,000 -55,000 -55,000 -55,000 -55,000 -55,000 -56,000 -55,000 -55,000 -55,000 -55,000 -55,000 -55,000 -37,000 -73,000 -56,000 -55,000 -7,555,000 -7,555,000 -55,000 -3,055,000 -55,000 -55,000 -55,000 -55,000 -55,000 -55,000 -55,000 -56,000 -54,000                         
          common stock repurchased on vesting of stock awards
            -182,000 -2,802,000 -397,000 -1,456,000 -94,000 -1,590,000 -304,000 -1,005,000 -71,000 -1,178,000 -258,000 -185,000 -61,000 -1,010,000 -287,000 -107,000 -1,000 -928,000 -110,000 -378,000                                                   
          non-cash lease expense
             1,568,000 1,597,000 1,711,000  1,756,000 1,758,000 1,756,000  1,737,000 1,701,000 1,798,000  2,000,000 2,065,000 1,872,000  1,849,000 1,821,000 1,724,000  1,734,000 1,736,000 1,773,000                                                
          accrued payroll, payroll taxes and related benefits
             18,250,000 -5,272,000 22,048,000 -13,073,000 9,294,000 2,563,000 13,944,000 -8,177,000 -50,702,000 -2,102,000 85,897,000 -51,053,000 13,768,000 3,098,000 83,926,000 -55,162,000 24,519,000 1,629,000 6,406,000 -22,905,000 16,023,000 -5,907,000 30,647,000 -34,942,000 8,546,000 -4,566,000 9,099,000 -628,000 15,285,000 -6,511,000 20,383,000 -7,952,000 -25,233,000 -1,815,000 66,767,000 -10,281,000 34,375,000 -13,351,000 27,774,000 -6,290,000 19,484,000 -14,544,000 20,225,000 -2,658,000 19,925,000 -7,965,000 9,148,000 -504,000 16,549,000 -349,000 -7,666,000 -729,000 23,559,000 -14,763,000 4,435,000 1,597,000 16,012,000 -11,891,000 3,122,000 -814,000 7,369,000 -9,027,000 3,468,000 -861,000 5,163,000 -4,709,000 3,474,000 -3,345,000 4,761,000 1,462,000 
          proceeds from sale of property
                3,000                                                                   
          reconciliations of net income to net cash from (used in) operating activities:
                                                                                   
          loss recognized on disposal of property and equipment
                                                                                   
          safety incentives liability
                -207,000 -161,000 -154,000 -265,000 -456,000 -255,000 -524,000 -1,038,000 -1,041,000 -1,520,000 -4,371,000 -7,573,000 -4,527,000 -2,413,000 -563,000 -1,620,000 223,000 411,000 388,000 -2,282,000 610,000 536,000 703,000 -1,171,000 973,000 1,475,000 1,880,000 -631,000 -162,000 735,000 2,446,000 563,000 2,648,000 1,267,000 169,000 1,345,000 526,000 -894,000 1,139,000 1,008,000 651,000 446,000 1,164,000 1,137,000 562,000 658,000 461,000 803,000 117,000 -84,000 271,000 512,000 82,000 -278,000 -151,000 -5,000 78,000 -111,000 -269,000 232,000 -974,000 -274,000 -2,154,000 250,000 368,000 -72,000 -15,000 
          proceeds from exercise of stock options
                  2,000 339,000 300,000 411,000 280,000 61,000 815,000 70,000 300,000 1,810,000 904,000 296,000 280,000 56,000 122,000             495,000 195,000      660,000 996,000 204,000  79,000 132,000 1,557,000  5,000      2,000 10,000 9,000          
          reconciliations of net loss to net cash from operating activities:
                                                                                   
          loss recognized on sale or disposal of property and equipment
                                                                                   
          income taxes receivable
                                    2,329,000 2,418,000 -3,061,000    -3,078,000 4,007,000 -2,969,000 4,904,000 -2,150,000 1,132,000   -1,596,000  3,051,000 1,829,000 -7,187,000 3,432,000 601,000 100,000     3,460,000 -11,000 -26,000 413,000 171,000 -1,890,000            
          income taxes payable
                                 738,000 -890,000 -843,000 1,974,000    -6,781,000 6,607,000 174,000 -3,041,000 -1,768,000 4,726,000     121,000 -1,989,000 2,431,000 -1,221,000 3,319,000 -272,000 -2,697,000 2,776,000    1,019,000            -52,000    43,000 631,000 216,000  
          purchase of property and equipment
                                 -2,545,000 -3,329,000 -1,798,000 -1,237,000 -925,000 -2,354,000 -1,163,000 -1,075,000 -323,000 -1,387,000 -902,000  -2,655,000 -1,288,000 -1,368,000 -709,000 -656,000 -762,000 -1,436,000 -620,000 -1,814,000 -716,000 -971,000 -1,211,000 -1,199,000  -1,139,000                        
          losses recognized on investments
                                  156,000 -130,000 127,000 -2,000 3,000 35,000    -6,000                                       
          common stock repurchased on vesting of restricted stock units
                                  -178,000 -2,784,000 -92,000 -76,000 -7,000 -1,532,000 -66,000 -68,000 -393,000 -40,000                                   
          excess tax from share-based compensation
                                                                                   
          customer deposits, long-term liabilities and other assets
                                    -92,000 -82,000 -10,000 -17,000 9,000 30,000 294,000 -474,000 -919,000 356,000 198,000 297,000 73,000 205,000 -1,683,000 64,000 217,000 74,000 -960,000 357,000 -156,000 240,000 225,000 77,000 37,000 19,000 143,000 92,000 -19,000 42,000 -6,000 1,000 9,000 10,000              
          excess tax benefits from share-based compensation
                                             265,000 55,000 15,000  333,000 109,000 15,000  896,000 907,000 280,000                          
          proceeds from exercise of stock options and vesting of restricted stock units
                                     223,000 48,000 53,000  3,000 48,000 97,000         76,000                              
          gains recognized on investments
                                                                                   
          purchase of restricted cash and investments
                                        -131,102,000 -244,142,000 -343,734,000 -359,331,000 -58,638,000                                       
          proceeds from sales and maturities of restricted cash and investments
                                        105,879,000 219,615,000 331,701,000 325,581,000 62,777,000                                       
          net increase in cash and cash equivalents
                                        24,265,000   -32,339,000 23,982,000   18,246,000  3,661,000    -27,289,000    2,268,000 23,566,000    7,354,000       -8,577,000 -1,834,000 11,368,000 -18,002,000 2,925,000 13,912,000 11,662,000       9,791,000 
          cash and cash equivalents, beginning of period
                                        50,768,000  25,218,000 11,544,000  93,557,000  45,747,000  49,571,000  30,924,000  36,671,000  42,214,000  -53,002,000 62,779,000  69,874,000  
          cash and cash equivalents, end of period
                                        24,265,000 17,705,000 -564,000 18,429,000  26,364,000 -43,042,000 43,464,000 -10,766,000 15,205,000  4,116,000 -18,399,000 66,268,000  26,131,000 -39,168,000 48,015,000  -14,177,000 -1,859,000 38,217,000  16,745,000 -2,326,000 27,798,000  817,000 -10,650,000 28,094,000  11,368,000 -18,002,000 45,139,000  11,662,000 -38,266,000 54,906,000  -13,387,000 1,318,000 69,707,000  
          excess tax benefit from share-based compensation
                                            518,000 -265,000 -55,000 -15,000 -121,000 -333,000 -109,000 -15,000                              
          net decrease in cash and cash equivalents
                                                   4,116,000    26,131,000     -1,859,000 -11,354,000   -2,326,000 -3,126,000  817,000          -7,873,000    -167,000  
          reconciliations of net loss to net cash used by operating activities:
                                                                                   
          gain recognized on investments
                                                                                   
          net cash used by operating activities
                                           -858,000                                        
          loss recognized on sale of property
                                                                                   
          changes in certain assets and liabilities:
                                                                                   
          purchase of equipment and software
                                                                                   
          proceeds from the issuance of long-term debt
                                                                                   
          commitment fee from the issuance of long-term debt
                                                                                   
          proceeds from the exercise of stock options
                                                                          4,000 716,000 213,000 8,000 3,000 57,000 12,000 13,000 5,000 
          cash and cash equivalents, beginning of year
                                                                                   
          cash and cash equivalents, end of year
                                                                                   
          losses recognized on sale of property and equipment
                                                                                   
          workers’ compensation claims liabilities
                                             14,881,000 11,907,000 9,468,000 7,346,000 6,283,000 7,639,000 85,837,000 2,371,000 7,691,000 16,464,000 11,437,000 7,331,000 6,648,000 8,828,000 5,896,000 4,090,000 1,849,000 8,630,000 2,399,000 1,250,000 560,000 803,000 789,000 715,000 987,000 -114,000 341,000 11,867,000 817,000 -736,000 913,000 1,522,000 703,000 3,274,000 -519,000 -660,000 -946,000 -3,215,000 
          losses recognized on marketable securities
                                              4,000 -1,000 -1,000 2,000 1,000 1,000 1,000               -105,000 -102,000 -59,000 -660,000 -54,000 134,000 100,000 3,496,000 -52,000 10,000 46,000 34,000 -3,000 11,000 44,000 
          purchase of marketable securities
                                              -77,000 -207,000 -861,000 -1,454,000 -3,998,000 -10,447,000 -9,053,000 -14,936,000 -14,826,000 -4,210,000 -29,612,000 -11,269,000 -4,580,000 -6,646,000 -8,867,000 -13,446,000 -17,267,000 -28,035,000 -16,220,000 -16,490,000 -11,438,000 -4,075,000 -14,616,000 -5,078,000           -2,000  
          proceeds from sales and maturities of marketable securities
                                              3,848,000 178,000 22,546,000 24,651,000 3,852,000 2,344,000 4,111,000 2,934,000 2,110,000 967,000 50,122,000 7,651,000 6,514,000 9,752,000 6,890,000 16,034,000 20,666,000 37,028,000 14,976,000 3,586,000 12,550,000 3,828,000 6,342,000 399,000 4,149,000 15,200,000 2,165,000 6,004,000 9,294,000 9,526,000        
          purchase of restricted certificates of deposit
                                                  -93,392,000   -12,789,000                            
          proceeds from maturities of restricted certificates of deposit
                                                                                   
          purchase of restricted marketable securities
                                              -52,611,000 -26,830,000 -34,551,000 -29,932,000 -23,998,000 -10,122,000 -6,570,000 -20,938,000 -4,222,000 -1,581,000 -4,064,000 -1,530,000 -4,060,000 -1,859,000 -1,996,000 -2,684,000 -2,151,000 -2,897,000 -1,870,000 -2,109,000 -431,000 -2,723,000 -49,000 -4,327,000 39,000 -1,419,000 -926,000 -1,638,000       -743,000 -1,104,000  
          proceeds from maturities of restricted marketable securities
                                              3,940,000 55,634,000 2,429,000 1,192,000 5,510,000 997,000 3,007,000 1,010,000 3,489,000 1,614,000 4,142,000 673,000 4,301,000 1,824,000 1,949,000 2,722,000 1,912,000 2,582,000 1,441,000 1,919,000 925,000 2,351,000 12,000 1,409,000 749,000 1,248,000 775,000 1,207,000 760,000 937,000 792,000 901,000 989,000 1,030,000 790,000 1,017,000 774,000 
          proceeds from exercise of stock options vesting of restricted stock units
                                               72,000                                    
          gain recognized on sale and leaseback
                                                      1,000 -31,000 -30,000 -30,000 -31,000 -31,000 -30,000 -30,000 -31,000 -31,000 -30,000 -30,000 -31,000 -31,000 -30,000 -30,000 -31,000 -30,000 -31,000    -31,000 -30,000 -31,000 -30,000 -31,000 -30,000 
          share based compensation
                                                          205,000 205,000 145,000 140,000 140,000 140,000 137,000 55,000 55,000 53,000 52,000 32,000 25,000 25,000 25,000 25,000          
          proceeds from the exercise of stock options and vesting of restricted stock units
                                                                                   
          redemption of mandatorily redeemable preferred stock
                                                                                  
          supplemental schedule of noncash financing activities:
                                                                                   
          issuance of mandatorily redeemable preferred stock
                                                          34,800,000                      
          gains recognized on marketable securities
                                                        -3,000   -1,000 47,000 1,000 -100,000                  
          issuance of long-term debt
                                                                                   
          changes in certain assets and liabilities, net of amounts purchased in acquisitions:
                                                                                   
          cash paid for acquisitions, including other direct costs
                                                                          -2,022,000 -1,000 -3,837,000 -1,677,000     
          purchase of property and equipment, net of amounts purchased in acquisitions
                                                             -720,000 -411,000 -391,000 -246,000 -199,000 -448,000 -404,000 -270,000 -484,000 -191,000 -158,000 -173,000 -359,000          
          supplemental schedule of noncash investing activities:
                                                                                   
          acquisitions of other businesses:
                                                                                   
          cost of acquisitions in excess of fair market value of net assets acquired
                                                                  357,000     2,022,000 1,000 3,807,000 1,649,000     
          intangible assets acquired
                                                                  15,000     15,000 20,000    
          tangible assets acquired
                                                                  3,000     15,000 8,000    
          net cash paid for acquisitions
                                                                  375,000     2,022,000 1,000 3,837,000 1,677,000     
          tax benefit of stock option exercises
                                                           -5,000 39,000 225,000 14,000 13,000 3,000    4,000 432,000 13,000 11,000 35,000 23,000 12,000 149,000 96,000 32,000 113,000 
          supplemental schedule of noncash financing activities: - sum
                                                             34,800,000                      
          cash paid for acquisitions
                                                                   -375,000              
          cost of acquisitions in excess of fair value of net assets acquired
                                                                                   
          purchase of trading marketable securities
                                                                                   
          proceeds from sales of trading marketable securities
                                                                                   
          customer deposits and other assets
                                                                      -981,000 -36,000 -32,000 -68,000 5,000 11,000 -56,000 -45,000 17,000 409,000 -171,000 293,000 932,000 
          less stock issued in connection with acquisitions
                                                                                   
          proceeds from sales of marketable securities
                                                                                  
          purchases of marketable securities
                                                                           -31,000      
          gains recognized on sale and leaseback
                                                                           -31,000        
          purchases of property and equipment, net of amounts purchased in acquisitions
                                                                           -253,000 -296,000 -145,000      
          purchases of restricted marketable securities
                                                                           -862,000 -1,490,000 -1,349,000      
          acquisition of other businesses:
                                                                                   
          proceeds from maturities of marketable securities
                                                                                  
          proceeds from issuance of common stock
                                                                                   
          less stock issued in connection with acquisition
                                                                                   
          cash paid for acquisition, including other direct costs
                                                                                -500,000  
          purchase of property and equipment, net of amounts purchased in acquisition
                                                                                -205,000 -224,000 -249,000 
          cost of acquisition in excess of fair market value of net assets acquired
                                                                                500,000  
          net cash paid for acquisition
                                                                                500,000  
          reconciliations of net income to net cash from
                                                                                   
          operating activities:
                                                                                   
          changes in certain assets and liabilities, net of amounts purchased
                                                                                   
          in acquisitions:
                                                                                   
          other long-term liabilities
                                                                                   
          proceeds from issuance of debt