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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Apr. 01, 2022
Cash flows from operating activities:    
Net income $ 29,124 $ 29,609
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of property, equipment and leasehold improvements 1,988 1,689
Provision for contract losses and doubtful accounts 892 686
Stock-based compensation 7,063 6,870
Deferred income tax provision 1,725 45
Changes in operating assets and liabilities:    
Accounts receivable (3,842) (8,333)
Prepaid expenses and other current assets (7,777) (9,948)
Change in operating leases (774) (535)
Accounts payable and accrued liabilities (2,271) 5,234
Accrued payroll and employee benefits (28,564) (27,576)
Deferred revenues (4,267) (4,093)
Net cash used in operating activities (6,703) (6,352)
Cash flows from investing activities:    
Capital expenditures (5,668) (2,606)
Net cash used in investing activities (5,668) (2,606)
Cash flows from financing activities:    
Payroll taxes for restricted stock units (9,920) (12,904)
Repurchase of common stock   (48,554)
Exercise of stock-based payment awards 680 564
Dividends and dividend equivalents rights (14,500) (12,514)
Net cash used in financing activities (23,740) (73,408)
Effect of foreign currency exchange rates on cash and cash equivalents 302 (271)
Net decrease in cash and cash equivalents (35,809) (82,637)
Cash and cash equivalents at beginning of period 161,458 297,687
Cash and cash equivalents at end of period $ 125,649 $ 215,050