Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 28,545	$ 68,688
Investments	114,142	101,244
Trade accounts receivable, net	207,430	118,506
Income taxes receivable	8,209	6,485
Prepaid expenses and other	14,613	15,961
Restricted cash and investments	99,183	96,991
Total current assets	472,122	407,875
Property, equipment and software, net	35,400	34,916
Operating lease right-of-use assets	23,475	23,025
Restricted cash and investments	261,020	258,153
Goodwill	47,820	47,820
Other assets	2,818	3,161
Total assets	842,655	774,950
Current liabilities:
Current portion of long-term debt	221	221
Accounts payable	5,611	4,746
Accrued payroll, payroll taxes and related benefits	233,132	149,989
Current operating lease liabilities	8,006	7,539
Other accrued liabilities	8,292	7,275
Workers' compensation claims liabilities	103,290	102,040
Safety incentives liability	11,254	18,827
Total current liabilities	369,806	290,637
Long-term workers' compensation claims liabilities	259,373	255,706
Long-term debt	3,455	3,510
Deferred income taxes	2,511	4,518
Long-term operating lease liabilities	16,387	16,419
Customer deposits and other long-term liabilities	6,638	5,925
Total liabilities	658,170	576,715
Commitments and contingencies (Notes 4 and 6)
Stockholders' equity:
Common stock, $.01 par value; 20,500 shares authorized, 7,554 and 7,566 shares issued and outstanding	76	76
Additional paid-in capital	26,483	24,885
Accumulated other comprehensive income	2,314	7,564
Retained earnings	155,612	165,710
Total stockholders' equity	184,485	198,235
Total liabilities and stockholders' equity	$ 842,655	$ 774,950