Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 288	$ (4,554)
Reconciliations of net income (loss) to net cash used in operating activities:
Depreciation and amortization	1,508	1,297
Non-cash lease expense	1,798	1,872
Investment amortization and losses recognized	336	203
Deferred Income taxes	25
Share-based compensation	1,830	1,060
Changes in certain operating assets and liabilities:
Trade accounts receivable	(100,589)	(88,924)
Income taxes	223	(1,724)
Prepaid expenses and other	(1,633)	1,348
Accounts payable	(153)	865
Accrued payroll, payroll taxes and related benefits	85,897	83,926
Other accrued liabilities	50	964
Workers' compensation claims liabilities	(16,894)	5,273
Safety incentives liability	(1,038)	(7,573)
Operating lease liabilities	(1,725)	(1,887)
Other assets and liabilities, net	(132)	(30)
Net cash used in operating activities	(30,209)	(7,884)
Cash flows from investing activities:
Purchase of property, equipment and software	(6,754)	(1,781)
Purchase of investments		(23,444)
Proceeds from sales and maturities of investments	10,796	9,381
Purchase of restricted investments	(2,272)	(132,788)
Proceeds from sales and maturities of restricted investments	18,735	24,286
Net cash provided by (used in) investing activities	20,505	(124,346)
Cash flows from financing activities:
Payments on long-term debt	(3,510)	(55)
Repurchase of common stock	(8,575)	(3,436)
Common stock repurchased on vesting of stock awards	(185)	(107)
Dividends paid	(2,229)	(2,278)
Proceeds from exercise of stock options	411	815
Net cash used in financing activities	(14,088)	(5,061)
Net decrease in cash, cash equivalents and restricted cash	(23,792)	(137,291)
Cash, cash equivalents and restricted cash, beginning of period	78,629	233,837
Cash, cash equivalents and restricted cash, end of period	$ 54,837	$ 96,546