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Commitments and Contingencies - Product Warranty Activities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Product warranty activities [Roll Forward]    
Balance at beginning of period $ 9,553us-gaap_ProductWarrantyAccrual $ 10,856us-gaap_ProductWarrantyAccrual
Warranty charged to cost of revenue 1,068us-gaap_ProductWarrantyAccrualWarrantiesIssued 909us-gaap_ProductWarrantyAccrualWarrantiesIssued
Utilization of warranty (998)us-gaap_ProductWarrantyAccrualPayments (938)us-gaap_ProductWarrantyAccrualPayments
Balance at end of period $ 9,623us-gaap_ProductWarrantyAccrual $ 10,827us-gaap_ProductWarrantyAccrual