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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Consolidated Statements of Comprehensive Income (Loss) [Abstract]        
Net income $ 19,767 $ 19,097 $ 34,049 $ 32,733
Other comprehensive income (loss), net of tax:        
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($91) and $18 in the three-month periods and net of tax of $200 and ($35) in the six-month periods, respectively (691) 381 529 (177)
Foreign currency translation adjustments, net of tax of ($403) and $142 in the three-month periods and net of tax of ($197) and $469 in the six-month period, respectively (14,507) 4,357 (9,181) 13,961
Other comprehensive income (loss) (15,198) 4,738 (8,652) 13,784
Comprehensive income $ 4,569 $ 23,835 $ 25,397 $ 46,517