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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2016
Jul. 03, 2015
Cash flows from operating activities:    
Net income $ 25,803 $ 22,030
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, equipment and leasehold improvements 2,927 2,705
Amortization of premiums and accretion of discounts on short-term investments 14 395
Deferred rent (184) (7)
Provision for contract losses and doubtful accounts 1,131 509
Stock-based compensation 7,929 7,902
Deferred income tax provision 424 (1,071)
Excess tax benefit from equity incentive plans 0 (4,486)
Changes in operating assets and liabilities:    
Accounts receivable (4,863) (7,684)
Prepaid expenses and other assets (5,198) 1,195
Accounts payable and accrued liabilities (1,716) 5,117
Accrued payroll and employee benefits (9,712) (9,446)
Deferred revenues (2,010) (2,339)
Net cash provided by operating activities 14,545 14,820
Cash flows from investing activities:    
Capital expenditures (3,382) (1,714)
Purchase of short-term investments (24,000) (4,000)
Maturity of short-term investments 21,450 10,555
Net cash (used in) provided by investing activities (5,932) 4,841
Cash flows from financing activities:    
Excess tax benefit from equity incentive plans 0 4,486
Payroll taxes for restricted stock units (7,613) (7,284)
Repurchase of common stock (4,458) (7,004)
Exercise of share-based payment awards 1,229 631
Dividends and dividend equivalents rights (9,515) (8,007)
Net cash used in financing activities (20,357) (17,178)
Effect of foreign currency exchange rates on cash and cash equivalents (464) (46)
Net (decrease) increase in cash and cash equivalents (12,208) 2,437
Cash and cash equivalents at beginning of period 125,751 129,490
Cash and cash equivalents at end of period $ 113,543 $ 131,927