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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 28,799us-gaap_NetIncomeLoss $ 16,992us-gaap_NetIncomeLoss
Other comprehensive income – unrealized gain on available-for-sale marketable debt securities, net of income tax 72us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 10us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income $ 28,871us-gaap_ComprehensiveIncomeNetOfTax $ 17,002us-gaap_ComprehensiveIncomeNetOfTax