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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 17,892 $ 13,131 $ 14,318
Reconciliations of net income to net cash provided by operating activities:      
Depreciation and amortization 2,037 1,477 1,344
Gains recognized on marketable securities (1) (4) (52)
Gain recognized on sale and leaseback (60) (122) (122)
Deferred income taxes (632) 301 453
Share based compensation 1,016 695 473
Excess tax benefit from share-based compensation (2,083) (295) (27)
Changes in certain assets and liabilities:      
Trade accounts receivable, net (21,665) (17,401) (8,924)
Income taxes receivable 0 4,133 (1,750)
Prepaid expenses and other 1,828 1,043 (4,099)
Accounts payable 1,257 356 675
Accrued payroll, payroll taxes and related benefits 22,948 17,228 14,815
Other accrued liabilities 7 6 (142)
Income taxes payable 3,047 567 0
Workers' compensation claims liabilities 41,880 20,663 12,839
Safety incentives liability 3,244 3,521 1,297
Customer deposits, long-term liabilities and other assets, net (519) 358 258
Net cash provided by operating activities 70,196 45,657 31,356
Cash flows from investing activities:      
Purchase of property and equipment (4,097) (3,712) (1,247)
Purchase of marketable securities (59,917) (33,539) (78,013)
Proceeds from sales and maturities of marketable securities 60,850 39,190 76,256
Purchase of restricted certificates of deposit (76,733) 0 0
Proceeds from maturities of restricted certificates of deposit 63,944 0 0
Purchase of restricted marketable securities (11,397) (10,599) (9,027)
Proceeds from maturities of restricted marketable securities 9,918 10,796 7,854
Net cash (used in) provided by investing activities (17,432) 2,136 (4,177)
Cash flows from financing activities:      
Proceeds from credit-line borrowings 132,664 50,229 0
Payments on credit-line borrowings (137,196) (45,697) 0
Issuance of long-term debt 0 5,512 0
Payments on long-term debt (220) (19) 0
Repurchase of common stock 0 (25,432) (4,778)
Redemption of mandatorily redeemable preferred stock 0 (34,800) 0
Dividends paid (4,056) (3,550) (3,835)
Proceeds from the exercise of stock options and vesting of restricted stock units 1,771 1,845 54
Excess tax benefit from share-based compensation 2,083 295 27
Net cash used in financing activities (4,954) (51,617) (8,532)
Net increase (decrease) in cash and cash equivalents 47,810 (3,824) 18,647
Cash and cash equivalents, beginning of year 45,747 49,571 30,924
Cash and cash equivalents, end of year 93,557 45,747 49,571
Mandatorily redeemable preferred stock [Member]
      
Supplemental schedule of noncash financing activities:      
Issuance of mandatorily redeemable preferred stock $ 0 $ 34,800 $ 0