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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Cash flows from operating activities:    
Net income including noncontrolling interest $ 47,097 $ 49,887
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:    
Depreciation and amortization 6,509 5,608
Share-based compensation 11,033 10,167
Provision (benefit) for doubtful accounts (5) 184
Provision for obsolete inventory 617 1,879
Provision for warranty costs 1,866 1,919
Benefit from deferred income taxes (319)  
Income tax benefit from exercise of stock options granted prior to January 1, 2006 259 1,290
Excess tax (deficit) benefit from share-based payment arrangements 340 (58)
Realized foreign exchange loss on forward contracts 45  
Changes in operating assets and liabilities:    
Increase in accounts receivable (4,982) (4,016)
(Increase) decrease in royalties receivable (67) 5,264
Increase in inventories (1,700) (2,374)
(Increase) decrease in deferred cost of goods sold 160 (4,321)
Increase in prepaid expenses (2,888) (5,459)
Increase in other assets (1,316) (436)
Decrease in accounts payable (2,730) (2,146)
Increase (decrease) in accrued compensation 2,344 (2,744)
Increase (decrease) in accrued liabilities 820 (1,001)
Increase (decrease) in income taxes payable (419) 1,249
Increase (decrease) in deferred revenue 2,490 (1,927)
Increase (decrease) in other liabilities (2,196) 1,101
Net cash provided by operating activities 56,958 54,066
Cash flows from investing activities:    
Purchases of property and equipment (7,812) (3,508)
Increase in intangible assets (2,904) (1,719)
Cash paid for acquisitions (37,399)  
Net cash used in investing activities (48,115) (5,227)
Cash flows from financing activities:    
Repayments of capital lease obligations (12) (37)
Proceeds from issuance of common stock 1,034 5,568
Excess tax deficit (benefit) from share-based payment arrangements (340) 58
Repurchases of common stock (26,268)  
Net proceeds from settlement of forward contracts 88  
Net cash provided by (used in) financing activities (25,498) 5,589
Effect of foreign currency exchange rates on cash (239) 459
Net increase (decrease) in cash and cash equivalents (16,894) 54,887
Cash and cash equivalents at beginning of period 129,882 88,305
Cash and cash equivalents at end of period $ 112,988 $ 143,192