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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (2,549) $ (2,213)
Reconciliations of net loss to net cash provided by operating activities:    
Depreciation and amortization 460 348
Gains recognized on marketable securities 0 (1)
Gain recognized on sale and leaseback (30) (30)
Deferred income taxes (4) (1,474)
Share-based compensation 183 140
Changes in certain assets and liabilities:    
Trade accounts receivable, net (6,371) (6,655)
Income taxes receivable (7,187) 100
Prepaid expenses and other 818 1,388
Accounts payable 487 343
Accrued payroll, payroll taxes and related benefits 19,925 16,549
Other accrued liabilities 162 467
Income taxes payable (272) 0
Workers' compensation claims liabilities 6,648 1,849
Safety incentives liability 446 658
Customer deposits, long-term liabilities and other assets, net 240 19
Net cash provided by operating activities 12,956 11,488
Cash flows from investing activities:    
Purchase of property and equipment (1,199) (720)
Proceeds from sales and maturities of marketable securities 7,651 16,034
Purchase of marketable securities (11,269) (13,446)
Proceeds from maturities of restricted marketable securities 673 2,722
Purchase of restricted marketable securities (1,530) (2,684)
Net cash (used in) provided by investing activities (5,674) 1,906
Cash flows from financing activities:    
Proceeds from credit-line borrowings 78,057 0
Payments on credit-line borrowings (82,589) 0
Payments on long-term debt (54) 0
Repurchase of common stock 0 (25,432)
Dividends paid (912) (1,098)
Proceeds from exercise of stock options 204 1,557
Excess tax benefits from share-based compensation 280 225
Net cash used in financing activities (5,014) (24,748)
Net increase (decrease) in cash and cash equivalents 2,268 (11,354)
Cash and cash equivalents, beginning of period 45,747 49,571
Cash and cash equivalents, end of period 48,015 38,217
Supplemental schedule of noncash financing activities:    
Issuance of mandatorily redeemable preferred stock $ 0 $ 34,800