Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021
Cash flows from operating activities:
Net income	$ 55,364	$ 56,248
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	3,501	3,298
Amortization of premiums and accretion of discounts on short-term investments		(10)
Provision for contract losses and doubtful accounts	1,470	932
Stock-based compensation	11,467	10,874
Deferred income tax provision	(422)	(549)
Changes in operating assets and liabilities:
Accounts receivable	(23,383)	(32,110)
Prepaid expenses and other current assets	(3,163)	(1,161)
Change in operating leases	(219)	(540)
Accounts payable and accrued liabilities	(582)	11,724
Accrued payroll and employee benefits	(15,680)	(2,438)
Deferred revenues	(4,537)	(816)
Net cash provided by operating activities	23,816	45,452
Cash flows from investing activities:
Capital expenditures	(5,914)	(4,246)
Purchase of short-term investments		(9,997)
Maturity of short-term investments		55,000
Net cash provided by (used in) investing activities	(5,914)	40,757
Cash flows from financing activities:
Payroll taxes for restricted stock units	(12,904)	(15,666)
Repurchase of common stock	(111,843)	(7,000)
Exercise of stock-based payment awards	1,070	1,023
Dividends and dividend equivalents rights	(24,859)	(22,354)
Net cash used in financing activities	(148,536)	(43,997)
Effect of foreign currency exchange rates on cash and cash equivalents	(1,434)	216
Net decrease in cash and cash equivalents	(132,068)	42,428
Cash and cash equivalents at beginning of period	297,687	197,525
Cash and cash equivalents at end of period	$ 165,619	$ 239,953