Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 01, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 215,050	$ 297,687
Accounts receivable, net of allowance for contract losses and doubtful accounts of $4,899 and $4,423 at April 1, 2022 and December 31, 2021, respectively	147,508	139,861
Prepaid expenses and other current assets	14,133	15,214
Total current assets	376,691	452,762
Property, equipment and leasehold improvements, net	61,077	59,971
Operating lease right-of-use assets	16,898	14,370
Goodwill	8,607	8,607
Deferred income taxes	46,501	46,546
Deferred compensation plan assets	106,255	99,962
Other assets	1,519	1,521
Total assets	617,548	683,739
Current liabilities:
Accounts payable and accrued liabilities	30,840	24,504
Accrued payroll and employee benefits	57,291	103,552
Deferred revenues	15,669	19,762
Operating lease liabilities	5,310	5,164
Total current liabilities	109,110	152,982
Other liabilities	2,659	2,886
Deferred compensation plan liabilities	107,561	100,999
Operating lease liabilities	11,654	9,807
Total liabilities	230,984	266,674
Stockholders’ equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at April 1, 2021 and December 31, 2021	66	66
Additional paid-in capital	293,889	281,419
Accumulated other comprehensive loss
Foreign currency translation adjustments	(2,293)	(1,983)
Retained earnings	493,387	478,370
Treasury stock, at cost; 13,885 and 13,591 shares held at April 1, 2021 and December 31, 2021, respectively	(398,485)	(340,807)
Total stockholders’ equity	386,564	417,065
Total liabilities and stockholders’ equity	$ 617,548	$ 683,739