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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
 [1]
Cash flows from operating activities:    
Net loss $ (8,003) $ (5,828)
Reconciliations of net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 749 683
(Gains) losses recognized on marketable securities (1) 2
Deferred income taxes 0 74
Share-based compensation 359 545
Excess tax benefit from share-based compensation (265) (15)
Changes in certain operating assets and liabilities:    
Trade accounts receivable (73,302) (27,749)
Income taxes receivable (2,969) (2,184)
Prepaid expenses and other (2,595) (2,845)
Accounts payable 723 781
Accrued payroll, payroll taxes and related benefits 66,767 34,162
Other accrued liabilities 392 (40)
Workers' compensation claims liabilities 9,468 6,445
Safety incentives liability 563 1,267
Customer deposits, long-term liabilities and other assets, net 297 205
Net cash (used in) provided by operating activities (7,817) 5,503
Cash flows from investing activities:    
Purchase of property and equipment (1,368) (657)
Purchase of marketable securities (207) (1,454)
Proceeds from sales and maturities of marketable securities 178 24,651
Purchase of restricted marketable securities (26,830) (29,932)
Proceeds from maturities of restricted marketable securities 55,634 1,192
Net cash provided by (used in) investing activities 27,407 (6,200)
Cash flows from financing activities:    
Proceeds from credit-line borrowings 11,300 28,251
Payments on credit-line borrowings (11,300) (22,479)
Payments on long-term debt (55) (55)
Common stock repurchased on vesting of restricted stock units (40) 0
Dividends paid (1,586) (1,569)
Proceeds from exercise of stock options vesting of restricted stock units 72 195
Excess tax benefits from share-based compensation 265 15
Net cash (used in) provided by financing activities (1,344) 4,358
Net increase in cash and cash equivalents 18,246 3,661
Cash and cash equivalents, beginning of period 25,218 11,544
Cash and cash equivalents, end of period $ 43,464 $ 15,205
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements