Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 165,619	$ 297,687
Accounts receivable, net of allowance for contract losses and doubtful accounts of $5,540 and $4,423 at July 1, 2022 and December 31, 2021, respectively	161,774	139,861
Prepaid expenses and other current assets	15,141	15,214
Total current assets	342,534	452,762
Property, equipment and leasehold improvements, net	63,921	59,971
Operating lease right-of-use assets	16,139	14,370
Goodwill	8,607	8,607
Deferred income taxes	46,968	46,546
Deferred compensation plan assets	87,163	99,962
Other assets	1,372	1,521
Total assets	566,704	683,739
Current liabilities:
Accounts payable and accrued liabilities	26,668	24,504
Accrued payroll and employee benefits	80,603	103,552
Deferred revenues	15,225	19,762
Operating lease liabilities	5,038	5,164
Total current liabilities	127,534	152,982
Other liabilities	2,554	2,886
Deferred compensation plan liabilities	87,639	100,999
Operating lease liabilities	11,483	9,807
Total liabilities	229,210	266,674
Stockholders’ equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at July 1, 2022 and December 31, 2021	66	66
Additional paid-in capital	296,098	281,419
Accumulated other comprehensive loss
Foreign currency translation adjustments	(3,643)	(1,983)
Retained earnings	506,605	478,370
Treasury stock, at cost; 14,590 and 13,591 shares held at July 1, 2022 and December 31, 2021, respectively	(461,632)	(340,807)
Total stockholders’ equity	337,494	417,065
Total liabilities and stockholders’ equity	$ 566,704	$ 683,739