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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Cash flows from operating activities:    
Net income $ 29,918 $ 28,753
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, equipment and leasehold improvements 3,667 3,459
Amortization of premiums and accretion of discounts on short-term investments 165 428
Deferred rent 884 (296)
Provision for doubtful accounts 822 1,304
Stock-based compensation 10,832 9,932
Deferred income tax provision (2,770) (2,780)
Tax benefit for stock plans (4,064) (2,762)
Changes in operating assets and liabilities:    
Accounts receivable 2,362 (16,594)
Prepaid expenses and other assets (3,498) (4,849)
Accounts payable and accrued liabilities (521) 6,574
Accrued payroll and employee benefits (3,469) (925)
Deferred revenues (510) (610)
Net cash provided by operating activities 33,818 21,634
Cash flows from investing activities:    
Capital expenditures (4,593) (3,425)
Purchase of short-term investments (11,813) (515)
Maturity of short-term investments 19,190 2,735
Sale of short-term investments 0 518
Net cash provided by (used in) investing activities 2,784 (687)
Cash flows from financing activities:    
Tax benefit for stock plans 4,064 2,762
Payroll taxes for restricted stock units (6,112) (3,531)
Repurchase of common stock (21,719) (19,437)
Exercise of share-based payment awards 1,497 2,071
Dividends paid (5,962) 0
Net cash used in financing activities (28,232) (18,135)
Effect of foreign currency exchange rates on cash and cash equivalents 109 402
Net increase in cash and cash equivalents 8,479 3,214
Cash and cash equivalents at beginning of period 113,268 84,439
Cash and cash equivalents at end of period $ 121,747 $ 87,653