Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 148,443	$ 297,687
Accounts receivable, net of allowance for contract losses and doubtful accounts of $6,157 and $4,423 at September 30, 2022 and December 31, 2021, respectively	166,014	139,861
Prepaid expenses and other current assets	18,055	15,214
Total current assets	332,512	452,762
Property, equipment and leasehold improvements, net	64,289	59,971
Operating lease right-of-use assets	18,088	14,370
Goodwill	8,607	8,607
Deferred income taxes	50,501	46,546
Deferred compensation plan assets	83,722	99,962
Other assets	1,284	1,521
Total assets	559,003	683,739
Current liabilities:
Accounts payable and accrued liabilities	31,825	24,504
Accrued payroll and employee benefits	84,938	103,552
Deferred revenues	15,791	19,762
Operating lease liabilities	5,363	5,164
Total current liabilities	137,917	152,982
Other liabilities	2,639	2,886
Deferred compensation plan liabilities	85,453	100,999
Operating lease liabilities	13,194	9,807
Total liabilities	239,203	266,674
Stockholders’ equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at September 30, 2022 and December 31, 2021	66	66
Additional paid-in capital	298,589	281,419
Accumulated other comprehensive loss
Foreign currency translation adjustments	(5,136)	(1,983)
Retained earnings	518,631	478,370
Treasury stock, at cost; 14,918 and 13,591 shares held at September 30, 2022 and December 31, 2021, respectively	(492,350)	(340,807)
Total stockholders’ equity	319,800	417,065
Total liabilities and stockholders’ equity	$ 559,003	$ 683,739