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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 2,944 $ 3,700
Reconciliations of net income to net cash provided by operating activities:    
Depreciation and amortization 1,392 1,197
Losses recognized on marketable securities 1 1
Deferred income taxes 0 (395)
Share-based compensation 1,069 671
Excess tax benefit from share-based compensation (70) (124)
Changes in certain assets and liabilities:    
Trade accounts receivable, net (35,235) (18,422)
Income taxes receivable 2,754 0
Prepaid expenses and other (1,876) (2,257)
Accounts payable (300) (817)
Accrued payroll, payroll taxes and related benefits 24,094 13,194
Other accrued liabilities (21) 768
Income taxes payable 0 1,210
Workers' compensation claims liabilities 13,629 10,062
Safety incentives liability 3,915 (368)
Customer deposits, long-term liabilities and other assets, net 278 291
Net cash provided by operating activities 12,574 8,711
Cash flows from investing activities:    
Purchase of property and equipment (1,365) (2,434)
Proceeds from sales and maturities of marketable securities 47,197 7,045
Purchase of marketable securities (2,315) (24,019)
Purchase of restricted certificates of deposit 0 (8,154)
Proceeds from maturities of restricted marketable securities 3,621 4,017
Purchase of restricted marketable securities (64,483) (27,508)
Net cash used in investing activities (17,345) (51,053)
Cash flows from financing activities:    
Proceeds from credit-line borrowings 44,934 3,731
Payments on credit-line borrowings (41,711) (3,731)
Payments on long-term debt (3,110) (110)
Repurchase of common stock 0 (991)
Common stock repurchased on vesting of restricted stock units (65) 0
Dividends paid (3,142) (2,582)
Proceeds from exercise of stock options 690 213
Excess tax benefits from share-based compensation 70 124
Net cash used in financing activities (2,334) (3,346)
Net decrease in cash and cash equivalents (7,105) (45,688)
Cash and cash equivalents, beginning of period 11,544 93,557
Cash and cash equivalents, end of period $ 4,439 $ 47,869