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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income (loss) $ 25,494 $ (25,546) [1] $ 15,673 [1]
Reconciliations of net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 2,851 2,506 [1] 2,037 [1]
Losses (gains) recognized on marketable securities (2) 3 [1] (1) [1]
Gain recognized on sale and leaseback 0 0 [1] (60) [1]
Deferred income taxes 2,728 (9,792) [1] (869) [1]
Share based compensation 2,386 1,699 [1] 1,016 [1]
Excess tax benefit from share-based compensation 68 (578) [1] (2,083) [1]
Changes in certain assets and liabilities:      
Trade accounts receivable 12,097 (17,041) [1] (21,665) [1]
Income taxes receivable 10,521 (11,421) [1] (165) [1]
Prepaid expenses and other 640 (387) [1] 1,828 [1]
Accounts payable 498 (533) [1] 1,257 [1]
Accrued payroll, payroll taxes and related benefits 5,506 21,950 [1] 24,455 [1]
Other accrued liabilities (64) 3,893 [1] 1,421 [1]
Income taxes payable 506 411 [1] 2,083 [1]
Workers' compensation claims liabilities 30,397 104,223 [1] 42,544 [1]
Safety incentives liability 7,021 1,146 [1] 3,244 [1]
Customer deposits, long-term liabilities and other assets, net (16) (937) [1] (519) [1]
Net cash provided by operating activities 100,631 69,596 [1] 70,196 [1]
Cash flows from investing activities:      
Purchase of property and equipment (2,996) (4,632) [1] (4,097) [1]
Proceeds from sales and maturities of marketable securities 52,996 13,241 [1] 60,850 [1]
Purchase of marketable securities (8,214) (38,434) [1] (59,917) [1]
Proceeds from maturities of restricted certificates of deposit 228,670 0 [1] 63,944 [1]
Purchase of restricted certificates of deposit (124,335) (101,546) [1] (76,733) [1]
Proceeds from maturities of restricted marketable securities 10,031 10,524 [1] 9,918 [1]
Purchase of restricted marketable securities (211,748) (61,628) [1] (11,397) [1]
Net cash used in investing activities (55,596) (182,475) [1] (17,432) [1]
Cash flows from financing activities:      
Proceeds from credit-line borrowings 46,106 6,242 [1] 132,664 [1]
Payments on credit-line borrowings (46,106) (6,242) [1] (137,196) [1]
Proceeds from the issuance of long-term debt 0 40,000 [1] 0 [1]
Commitment fee from the issuance of long-term debt 0 (400) [1] 0 [1]
Payments on long-term debt (25,220) (220) [1] (220) [1]
Repurchase of common stock 0 (3,676) [1] 0 [1]
Common stock repurchased on vesting of restricted stock units (465) (407) [1] (89) [1]
Dividends paid (6,310) (5,443) [1] (4,056) [1]
Proceeds from the exercise of stock options and vesting of restricted stock units 702 434 [1] 1,860 [1]
Excess tax benefit from share-based compensation (68) 578 [1] 2,083 [1]
Net cash (used in) provided by financing activities (31,361) 30,866 [1] (4,954) [1]
Net increase (decrease) in cash and cash equivalents 13,674 (82,013) [1] 47,810 [1]
Cash and cash equivalents, beginning of year [1] 11,544 93,557 45,747
Cash and cash equivalents, end of year $ 25,218 $ 11,544 [1] $ 93,557 [1]
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements