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Summary of Other Long Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 03, 2015
Dec. 31, 2014
Other Liabilities Noncurrent [Abstract]    
Capital lease obligations $ 9,458us-gaap_CapitalLeaseObligationsNoncurrent $ 9,507us-gaap_CapitalLeaseObligationsNoncurrent
Accrued pension liabilities 5,409us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 6,037us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Other 3,828us-gaap_OtherAccruedLiabilitiesNoncurrent 3,275us-gaap_OtherAccruedLiabilitiesNoncurrent
Total $ 18,695us-gaap_OtherLiabilitiesNoncurrent $ 18,819us-gaap_OtherLiabilitiesNoncurrent