Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 46,074	$ 69,405
Investments	81,334	96,763
Trade accounts receivable, net	256,296	155,707
Prepaid expenses and other	19,239	17,606
Restricted cash and investments	113,427	67,238
Total current assets	516,370	406,719
Property, equipment and software, net	41,595	36,277
Operating lease right-of-use assets	18,367	20,697
Restricted cash and investments	153,982	232,965
Goodwill	47,820	47,820
Other assets	2,608	2,474
Deferred income taxes	3,775
Total assets	784,517	746,952
Current liabilities:
Current portion of long-term debt		3,510
Accounts payable	4,332	4,485
Accrued payroll, payroll taxes and related benefits	283,937	199,067
Income taxes payable	1,896	1,673
Current operating lease liabilities	6,603	7,191
Other accrued liabilities	15,958	15,120
Workers' compensation claims liabilities	75,893	80,028
Safety incentives liability	3,284	4,322
Total current liabilities	391,903	315,396
Long-term workers' compensation claims liabilities	186,753	199,379
Deferred income taxes		1,687
Long-term operating lease liabilities	13,000	14,598
Customer deposits and other long-term liabilities	7,149	7,362
Total liabilities	598,805	538,422
Commitments and contingencies (Notes 4 and 6)
Stockholders' equity:
Common stock, $.01 par value; 20,500 shares authorized, 7,314 and 7,415 shares issued and outstanding	73	74
Additional paid-in capital	30,626	29,054
Accumulated other comprehensive (loss) income	(13,279)	1,079
Retained earnings	168,292	178,323
Total stockholders' equity	185,712	208,530
Total liabilities and stockholders' equity	$ 784,517	$ 746,952