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Summary of Other Long Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities Disclosure [Abstract]    
Capital lease obligations $ 9,507us-gaap_CapitalLeaseObligationsNoncurrent  
Accrued pension liabilities 6,037us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 2,322us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Other 3,275us-gaap_OtherAccruedLiabilitiesNoncurrent 2,706us-gaap_OtherAccruedLiabilitiesNoncurrent
Total $ 18,819us-gaap_OtherLiabilitiesNoncurrent $ 5,028us-gaap_OtherLiabilitiesNoncurrent