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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 04, 2014
Jun. 28, 2013
Cash flows from operating activities:    
Net income $ 20,418 $ 18,824
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, equipment and leasehold improvements 2,633 2,384
Amortization of premiums and accretion of discounts on short-term investments 443 137
Deferred rent (132) 942
Provision for doubtful accounts 828 473
Stock-based compensation 7,875 8,331
Deferred income tax provision (3,896) (1,692)
Excess tax benefit from equity awards (5,090) (3,807)
Changes in operating assets and liabilities:    
Accounts receivable (9,643) (1,558)
Prepaid expenses and other assets (3,348) (3,495)
Accounts payable and accrued liabilities 6,504 (43)
Accrued payroll and employee benefits (6,027) (5,175)
Deferred revenues 165 1,079
Net cash provided by operating activities 10,730 16,400
Cash flows from investing activities:    
Capital expenditures (1,976) (3,701)
Purchase of short-term investments (1,067) 0
Maturity of short-term investments 2,186 14,290
Net cash (used in) provided by investing activities (857) 10,589
Cash flows from financing activities:    
Excess tax benefit from equity awards 5,090 3,807
Payroll taxes for restricted stock units (6,267) (6,112)
Repurchase of common stock (14,383) (17,626)
Exercise of share-based payment awards 1,540 883
Dividends and dividend equivalents paid (6,580) (3,967)
Net cash used in financing activities (20,600) (23,015)
Effect of foreign currency exchange rates on cash and cash equivalents 674 (598)
Net (decrease) increase in cash and cash equivalents (10,053) 3,376
Cash and cash equivalents at beginning of period 122,948 113,268
Cash and cash equivalents at end of period $ 112,895 $ 116,644