Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (3,407)	$ (2,300)
Reconciliations of net loss to net cash provided by operating activities:
Depreciation and amortization	1,000	969
Non-cash lease expense	1,724	1,773
Investment (accretion) amortization and (gains) losses recognized	81	(130)
Deferred Income taxes	508
Share-based compensation	342	1,387
Changes in certain operating assets and liabilities:
Trade accounts receivable	(2,229)	(2,560)
Income taxes	(1,102)	(843)
Prepaid expenses and other	(1,592)	(2,752)
Accounts payable	(1,660)	1,021
Accrued payroll, payroll taxes and related benefits	6,406	30,647
Other accrued liabilities	(2,095)	(3,512)
Workers' compensation claims liabilities	6,452	9,508
Safety incentives liability	(1,620)	(2,282)
Operating lease liabilities	(1,672)	(1,374)
Other assets and liabilities, net	(95)	1,220
Net cash provided by operating activities	1,041	30,772
Cash flows from investing activities:
Purchase of property, equipment and software	(3,439)	(1,798)
Purchase of investments	(23,722)	(8)
Proceeds from sales and maturities of investments	21,758	15
Purchase of restricted investments	(1,828)	(2,023)
Proceeds from sales and maturities of restricted investments	14,449	30,859
Net cash provided by investing activities	7,218	27,045
Cash flows from financing activities:
Payments on long-term debt	(55)	(55)
Repurchase of common stock	(2,987)
Common stock repurchased on vesting of stock awards	(378)	(178)
Dividends paid	(2,262)	(1,852)
Proceeds from exercise of stock options	904	122
Net cash used in financing activities	(4,778)	(1,963)
Net increase in cash, cash equivalents and restricted cash	3,481	55,854
Cash, cash equivalents and restricted cash, beginning of period	273,341	140,702
Cash, cash equivalents and restricted cash, end of period	$ 276,822	$ 196,556