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Stockholders' Equity Stockholders' Equity - Reclassification from AOCI to Statement of Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ 49us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion $ 0us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
Product cost of revenue [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion 7us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
0us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Operating Expense [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ 42us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
$ 0us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember