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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 10,752 $ 14,047
Reconciliations of net income to net cash provided by operating activities:    
Depreciation and amortization 2,341 2,113
Losses (gains) recognized on investments 3 (2)
Losses recognized on sale of property and equipment 31 0
Deferred income taxes 0 9
Share-based compensation 1,881 1,727
Excess tax benefit from share-based compensation (265) (56)
Changes in certain operating assets and liabilities:    
Trade accounts receivable (49,545) (53,079)
Income taxes receivable 1,038 12,003
Prepaid expenses and other (464) (455)
Accounts payable 1,303 463
Accrued payroll, payroll taxes and related benefits 39,719 45,290
Other accrued liabilities 4,585 (3,847)
Income taxes payable 5,062 4,478
Workers' compensation claims liabilities 36,256 22,493
Safety incentives liability 3,744 5,728
Customer deposits, long-term liabilities and other assets, net 851 378
Net cash provided by operating activities 57,292 51,290
Cash flows used in investing activities:    
Purchase of property and equipment (5,311) (1,903)
Proceeds from sale of property and equipment 1,478 0
Purchase of investments (274) (2,943)
Proceeds from sales and maturities of investments 4,504 47,797
Purchase of restricted cash and investments (127,207) (99,482)
Proceeds from sales and maturities of restricted cash and investments 91,113 25,190
Net cash used in investing activities (35,697) (31,341)
Cash flows used in financing activities:    
Proceeds from credit-line borrowings 14,868 46,106
Payments on credit-line borrowings (14,868) (46,106)
Payments on long-term debt (15,165) (10,166)
Common stock repurchased on vesting of restricted stock units (433) (465)
Dividends paid (4,766) (4,726)
Proceeds from exercise of stock options and vesting of restricted stock units 72 689
Excess tax benefits from share-based compensation 265 56
Net cash used in financing activities (20,027) (14,612)
Net increase in cash and cash equivalents 1,568 5,337
Cash and cash equivalents, beginning of period 25,218 11,544
Cash and cash equivalents, end of period $ 26,786 $ 16,881