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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net Income $ 12,331 $ 7,342
Reconciliations of net income to net cash provided by operating activities:    
Depreciation and amortization 1,487 1,076
Gains recognized on marketable securities (1) (1)
Gain recognized on sale and leaseback (61) (92)
Deferred income taxes (48) 30
Share-based compensation 602 490
Changes in certain assets and liabilities:    
Trade accounts receivable, net (34,796) (24,498)
Income taxes receivable (2,307) 701
Prepaid expenses and other 3,410 4,361
Accounts payable 726 496
Accrued payroll, payroll taxes and related benefits 37,492 25,193
Other accrued liabilities 647 55
Income taxes payable (272) 2,969
Workers' compensation claims liabilities 25,416 11,835
Safety incentives liability 2,105 2,357
Customer deposits, long-term liabilities and other assets, net 441 133
Net cash provided by operating activities 47,172 32,447
Cash flows from investing activities:    
Purchase of property and equipment (3,381) (2,666)
Proceeds from sales and maturities of marketable securities 58,740 32,676
Purchase of marketable securities (45,091) (28,959)
Purchase of restricted certificates of deposit (63,944) 0
Proceeds from maturities of restricted marketable securities 6,429 6,495
Purchase of restricted marketable securities (7,175) (6,539)
Net cash used in investing activities (54,422) 1,007
Cash flows from financing activities:    
Proceeds from credit-line borrowings 132,664 12,186
Payments on credit-line borrowings (137,196) (12,186)
Redemption of mandatorily redeemable preferred stock 0 (34,800)
Payments on long-term debt (165) 0
Repurchase of common stock 0 (25,432)
Dividends paid (2,765) (2,639)
Proceeds from exercise of stock options 1,860 1,768
Excess tax benefits from share-based compensation 2,083 259
Net cash used in financing activities (3,519) (60,844)
Net decrease in cash and cash equivalents (10,769) (27,390)
Cash and cash equivalents, beginning of period 45,747 49,571
Cash and cash equivalents, end of period 34,978 22,181
Mandatorily redeemable preferred stock [Member]
    
Supplemental schedule of noncash financing activities:    
Issuance of mandatorily redeemable preferred stock $ 0 $ 34,800