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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income including noncontrolling interest $ 31,050 $ 33,534
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:    
Depreciation and amortization 5,600 3,973
Share-based compensation 6,390 7,837
Loss on disposal of property and equipment 78  
Provision for (benefit from) doubtful accounts 314 (216)
Provision for obsolete inventory 556 533
Provision for warranty costs 1,280 1,222
Provision for (benefit from) deferred income taxes 1,687 (319)
Income tax benefit from exercise of stock options granted prior to January 1, 2006 436 138
Excess tax deficit from share-based compensation arrangements 504 285
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable 569 (7,154)
(Increase) decrease in royalties receivable 130 (151)
(Increase) decrease in inventories (8,976) 152
Increase in deferred cost of goods sold (5,718) (367)
Increase in prepaid expenses (4,475) (325)
(Increase) decrease in other assets 1,160 (1,896)
Increase (decrease) in accounts payable 4,644 (5,410)
Decrease in accrued compensation (793) (1,166)
Increase (decrease) in accrued liabilities (2,003) 310
Decrease in income taxes payable (1,261) (485)
Increase in deferred revenue 1,000 2,218
Increase (decrease) in other liabilities 231 (1,544)
Net cash provided by operating activities 32,403 31,169
Cash flows from investing activities:    
Purchases of property and equipment (3,936) (4,842)
Increase in intangible assets (2,154) (1,220)
Cash paid for acquisition   (7,150)
Net cash used in investing activities (6,090) (13,212)
Cash flows from financing activities:    
Repayments of capital lease obligations (96) (23)
Proceeds from issuance of common stock 897 593
Excess tax deficit from share-based compensation arrangements (504) (285)
Repurchases of common stock (19,790) (26,268)
Net cash used in financing activities (19,493) (25,983)
Effect of foreign currency exchange rates on cash (301) (339)
Net increase (decrease) in cash and cash equivalents 6,519 (8,365)
Cash and cash equivalents at beginning of period 71,554 129,882
Cash and cash equivalents at end of period $ 78,073 $ 121,517