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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Cash flows from operating activities:    
Net income $ 15,350 $ 10,333
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, equipment and leasehold improvements 1,403 1,381
Amortization of premiums and accretion of discounts on short-term investments 22 213
Deferred rent (110) (145)
Provision for contract losses and doubtful accounts 434 390
Stock-based compensation 5,220 5,221
Deferred income tax provision (430) (1,938)
Excess tax benefit from equity incentive plans 0 (4,431)
Changes in operating assets and liabilities:    
Accounts receivable (6,769) (2,098)
Prepaid expenses and other assets 728 2,689
Accounts payable and accrued liabilities (2,300) 4,553
Accrued payroll and employee benefits (11,944) (12,017)
Deferred revenues (1,291) (2,450)
Net cash provided by operating activities 313 1,701
Cash flows from investing activities:    
Capital expenditures (1,481) (627)
Purchase of short-term investments (12,000) 0
Maturity of short-term investments 1,450 3,320
Net cash (used in) provided by investing activities (12,031) 2,693
Cash flows from financing activities:    
Excess tax benefit from equity incentive plans 0 4,431
Payroll taxes for restricted stock units (7,613) (7,267)
Repurchase of common stock (3,500) (3,500)
Exercise of share-based payment awards 305 289
Dividends and dividend equivalents rights (4,628) (4,023)
Net cash used in financing activities (15,436) (10,070)
Effect of foreign currency exchange rates on cash and cash equivalents (62) (156)
Net decrease in cash and cash equivalents (27,216) (5,832)
Cash and cash equivalents at beginning of period 125,751 129,490
Cash and cash equivalents at end of period $ 98,535 $ 123,658