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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net (loss) income $ (34,118) $ 12,331
Reconciliations of net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,843 1,487
Losses (gains) recognized on marketable securities 2 (1)
Gain recognized on sale and leaseback 0 (61)
Deferred income taxes (14,109) (48)
Share-based compensation 1,186 602
Excess tax benefit from share-based compensation (457) (2,083)
Changes in certain assets and liabilities:    
Trade accounts receivable, net (44,175) (34,796)
Income taxes receivable (12,553) (2,307)
Prepaid expenses and other (1,940) 3,410
Accounts payable (413) 726
Accrued payroll, payroll taxes and related benefits 40,968 37,492
Other accrued liabilities 831 647
Income taxes payable (779) 1,811
Workers' compensation claims liabilities 95,899 25,416
Safety incentives liability 977 2,105
Customer deposits, long-term liabilities and other assets, net 355 441
Net cash provided by operating activities 33,517 47,172
Cash flows from investing activities:    
Purchase of property and equipment (3,870) (3,381)
Proceeds from sales and maturities of marketable securities 9,389 58,740
Purchase of marketable securities (34,436) (45,091)
Purchase of restricted certificates of deposit (8,154) (63,944)
Proceeds from maturities of restricted marketable securities 5,014 6,429
Purchase of restricted marketable securities (37,630) (7,175)
Net cash used in investing activities (69,687) (54,422)
Cash flows from financing activities:    
Proceeds from credit-line borrowings 3,731 132,664
Payments on credit-line borrowings (3,731) (137,196)
Payments on long-term debt (165) (165)
Repurchase of common stock (1,650) 0
Common stock repurchased on vesting of restricted stock units (407) 0
Dividends paid (3,875) (2,765)
Proceeds from exercise of stock options and vesting of restricted stock units 238 1,860
Excess tax benefits from share-based compensation 457 2,083
Net cash used in financing activities (5,402) (3,519)
Net decrease in cash and cash equivalents (41,572) (10,769)
Cash and cash equivalents, beginning of period 93,557 45,747
Cash and cash equivalents, end of period $ 51,985 $ 34,978