Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	[1]
Cash flows from operating activities:
Net income	$ 519	$ 3,074
Reconciliations of net income to net cash provided by operating activities:
Depreciation and amortization	1,518	1,392
Losses recognized on marketable securities	3	1
Deferred income taxes	0	72
Share-based compensation	1,040	1,069
Excess tax benefit from share-based compensation	(265)	(70)
Changes in certain operating assets and liabilities:
Trade accounts receivable	(87,398)	(35,235)
Income taxes receivable	1,038	2,753
Prepaid expenses and other	(1,645)	(1,876)
Accounts payable	1,241	(300)
Accrued payroll, payroll taxes and related benefits	64,952	24,919
Other accrued liabilities	(1,747)	(1,385)
Income taxes payable	336	0
Workers' compensation claims liabilities	21,375	13,966
Safety incentives liability	3,009	3,915
Customer deposits, long-term liabilities and other assets, net	495	278
Net cash provided by operating activities	4,471	12,573
Cash flows from investing activities:
Purchase of property and equipment	(2,656)	(1,365)
Purchase of marketable securities	(284)	(2,315)
Proceeds from sales and maturities of marketable securities	4,026	47,197
Purchase of restricted certificates of deposit	(10,000)	0
Proceeds from maturities of restricted certificates of deposit	10,000	0
Purchase of restricted marketable securities	(79,441)	(64,483)
Proceeds from maturities of restricted marketable securities	59,574	3,621
Net cash used in investing activities	(18,781)	(17,345)
Cash flows from financing activities:
Proceeds from credit-line borrowings	11,300	44,934
Payments on credit-line borrowings	(11,300)	(41,711)
Payments on long-term debt	(7,610)	(3,110)
Common stock repurchased on vesting of restricted stock units	(40)	(65)
Dividends paid	(3,173)	(3,141)
Proceeds from exercise of stock options and vesting of restricted stock units	72	690
Excess tax benefits from share-based compensation	265	70
Net cash used in financing activities	(10,486)	(2,333)
Net decrease in cash and cash equivalents	(24,796)	(7,105)
Cash and cash equivalents, beginning of period	25,218	11,544
Cash and cash equivalents, end of period	$ 422	$ 4,439

[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements