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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
 [1]
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
 [1]
Dec. 31, 2012
Current assets:                    
Cash and cash equivalents $ 25,218 $ 16,881 $ 4,439 $ 15,205 $ 11,544 $ 51,985 $ 47,869 $ 66,268 $ 93,557 $ 45,747 [1]
Marketable securities 0 5,071 0 21,670 29,957 34,760 32,033 31,013    
Trade accounts receivable, net 90,529 155,706 137,862 130,376 102,627 129,761 104,008 95,956    
Income taxes receivable 1,038 0 9,194 14,131 11,947 14,296 34,803 3,059    
Prepaid expenses and other 3,173 4,268 5,689 6,658 3,813 4,966 5,283 4,621    
Restricted certificates of deposit 10,000 0 26,015 0 0          
Restricted marketable securities and workers' compensation deposits 76,110 30,850 21,343 12,533 3,776 0 0 0    
Deferred income taxes 20,941 18,972 18,983 18,972 19,138 20,263 11,977 11,969    
Total current assets 227,009 231,748 223,525 219,545 182,802 256,031 235,973 212,886    
Marketable securities 6,082 6,089 6,048 6,034 20,930 15,984 10,597 6,680    
Property, equipment and software, net 22,820 22,465 22,648 22,648 22,675 22,576 21,786 21,779    
Restricted certificates of deposit 0 88,320 88,320 114,335 114,335 20,943 20,943 12,789    
Restricted marketable securities and workers' compensation deposits 187,916 126,695 101,828 78,516 58,533 43,821 34,696 31,133    
Other assets 5,130 4,728 4,840 4,960 5,306 3,836 3,979 4,028    
Goodwill 47,820 47,820 47,820 47,820 47,820 47,820 47,820 47,820    
Total assets 496,777 527,865 495,029 493,858 452,401 411,011 375,794 337,115    
Current liabilities:                    
Current portion of long-term debt 19,833 34,887 27,220 25,220 25,220 220 220 220    
Accounts payable 3,217 3,182 2,419 3,500 2,719 2,839 2,435 2,382    
Accrued payroll, payroll taxes and related benefits 121,343 161,127 140,756 149,999 115,837 129,264 104,083 112,669    
Other accrued liabilities 6,166 2,383 4,845 6,190 6,230 5,440 3,227 2,541    
Workers' compensation claims liabilities 65,581 66,448 65,388 61,830 61,064 58,017 54,040 44,383    
Safety incentives liability 21,253 19,960 18,147 15,499 14,232 14,063 12,718 12,192    
Total current liabilities 237,393 292,465 261,998 268,010 225,302 209,843 176,723 174,387    
Long-term workers' compensation claims liabilities 190,094 181,323 173,856 169,893 164,214 162,484 162,246 84,525    
Long-term debt 0 0 14,723 19,778 19,833 4,888 4,943 4,998    
Deferred income taxes 13,256 8,421 8,421 8,421 8,557 4,973 10,392 10,392    
Customer deposits and other long-term liabilities 1,483 1,475 1,487 1,534 1,675 1,888 1,967 1,799    
Total liabilities $ 442,226 $ 483,684 $ 460,485 $ 467,636 $ 419,581 $ 384,076 $ 356,271 $ 276,101    
Commitments and contingencies (Notes 7, 9 and 13)    
Stockholders' equity:                    
Common stock, $.01 par value; 20,500 shares authorized, 7,203 and 7,126 shares issued and outstanding $ 72 $ 72 $ 72 $ 71 $ 71 $ 72 $ 72 $ 72    
Additional paid-in capital 6,964 6,416 6,173 5,165 4,410 5,605 5,798 6,203    
Accumulated other comprehensive loss (31) 10 4 21 (23) (18) (50) (37)    
Retained earnings 47,546 37,683 28,295 20,965 28,362 21,276 13,703 54,776    
Total stockholders' equity 54,551 44,181 34,544 26,222 32,820 26,935 19,523 61,014 $ 65,178 $ 48,740
Total liabilities and stockholders' equity $ 496,777 $ 527,865 $ 495,029 $ 493,858 $ 452,401 $ 411,011 $ 375,794 $ 337,115    
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements