Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020
Cash flows from operating activities:
Net income	$ 56,248	$ 42,628
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	3,298	3,487
Amortization of premiums and accretion of discounts on short-term investments	(10)	(112)
Provision for contract losses and doubtful accounts	932	2,817
Stock-based compensation	10,874	9,600
Deferred income tax provision	(549)	(398)
Changes in operating assets and liabilities:
Accounts receivable	(32,110)	7,980
Prepaid expenses and other current assets	(1,161)	(10,666)
Change in operating leases	(540)	(529)
Accounts payable and accrued liabilities	11,724	(1,992)
Accrued payroll and employee benefits	(2,438)	(14,816)
Deferred revenues	(816)	(3,800)
Net cash provided by operating activities	45,452	34,199
Cash flows from investing activities:
Capital expenditures	(4,246)	(2,467)
Purchase of short-term investments	(9,997)
Maturity of short-term investments	55,000	21,000
Net cash provided by investing activities	40,757	18,533
Cash flows from financing activities:
Payroll taxes for restricted stock units	(15,666)	(15,263)
Repurchase of common stock	(7,000)	(40,049)
Exercise of stock-based payment awards	1,023	2,534
Dividends and dividend equivalents rights	(22,354)	(20,128)
Net cash used in financing activities	(43,997)	(72,906)
Effect of foreign currency exchange rates on cash and cash equivalents	216	(330)
Net change in cash and cash equivalents	42,428	(20,504)
Cash and cash equivalents at beginning of period	197,525	176,436
Cash and cash equivalents at end of period	$ 239,953	$ 155,932