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Nature of Operations and Summary of Significant Accounting Policies - Warranty Obligations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Changes in the carrying amount of accrued warranty costs [Roll Forward]    
Balance at beginning of period $ 3,875us-gaap_StandardProductWarrantyAccrual $ 4,571us-gaap_StandardProductWarrantyAccrual
Provision 408us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 559us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Usage (543)us-gaap_StandardProductWarrantyAccrualPayments (697)us-gaap_StandardProductWarrantyAccrualPayments
Currency translation (192)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease (9)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
Balance at end of period $ 3,548us-gaap_StandardProductWarrantyAccrual $ 4,424us-gaap_StandardProductWarrantyAccrual