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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net Income $ 3,337 $ 1,530
Reconciliations of net income to net cash provided by operating activities:    
Depreciation and amortization 966 704
Gains recognized on marketable securities (1) 0
Gain recognized on sale and leaseback (61) (61)
Deferred income taxes (58) 53
Share-based compensation 367 285
Changes in certain assets and liabilities:    
Trade accounts receivable, net (16,931) (16,913)
Income taxes receivable (5,358) 701
Prepaid expenses and other 1,869 2,983
Accounts payable 815 274
Accrued payroll, payroll taxes and related benefits 17,267 16,045
Other accrued liabilities 330 50
Income taxes payable (272) 193
Workers' compensation claims liabilities 13,979 5,939
Safety incentives liability 1,097 1,220
Customer deposits, long-term liabilities and other assets, net 84 56
Net cash provided by operating activities 17,430 13,059
Cash flows from investing activities:    
Purchase of property and equipment (2,410) (1,527)
Proceeds from sales and maturities of marketable securities 57,773 22,924
Purchase of marketable securities (40,881) (22,313)
Purchase of restricted certificates of deposit (63,944) 0
Proceeds from maturities of restricted marketable securities 4,815 4,671
Purchase of restricted marketable securities (5,594) (4,680)
Net cash used in investing activities (50,241) (925)
Cash flows from financing activities:    
Proceeds from credit-line borrowings 132,664 0
Payments on credit-line borrowings (137,196) 0
Payments on long-term debt (110) 0
Repurchase of common stock 0 (25,432)
Dividends paid (1,834) (1,868)
Proceeds from exercise of stock options 1,200 1,689
Excess tax benefits from share-based compensation 1,187 264
Net cash used in financing activities (4,089) (25,347)
Net decrease in cash and cash equivalents (36,900) (13,213)
Cash and cash equivalents, beginning of period 45,747 49,571
Cash and cash equivalents, end of period 8,847 36,358
Supplemental schedule of noncash financing activities:    
Issuance of mandatorily redeemable preferred stock $ 0 $ 34,800