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Income Taxes Deferred Tax Assets Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets, Operating Loss Carryforwards $ 6,340us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 5,382us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Credit Carryforwards 428us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 447us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 16,424us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 8,305us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Deferred Tax Liabilities, Property, Plant and Equipment (6,993)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (4,494)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 4,925us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 4,684us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Other 1,804us-gaap_DeferredTaxAssetsOther 657us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 29,921us-gaap_DeferredTaxAssetsGross 19,475us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (7,236)us-gaap_DeferredTaxAssetsValuationAllowance (6,087)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net 22,685us-gaap_DeferredTaxAssetsNet 13,388us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets (5,650)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (3,050)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities, Other (10,339)us-gaap_DeferredTaxLiabilitiesOther (2,301)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities (22,982)us-gaap_DeferredTaxLiabilities (9,845)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets (Liabilities), Net (297)us-gaap_DeferredTaxAssetsLiabilitiesNet 3,543us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Net, Current 6,130us-gaap_DeferredTaxAssetsNetCurrent 8,936us-gaap_DeferredTaxAssetsNetCurrent
Deferred Tax Liabilities, Current (3,093)us-gaap_DeferredTaxLiabilitiesCurrent (975)us-gaap_DeferredTaxLiabilitiesCurrent
Deferred Tax Assets, Net, Noncurrent 3,876us-gaap_DeferredTaxAssetsNetNoncurrent 4,452us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred Tax Liabilities, Noncurrent (7,210)us-gaap_DeferredTaxLiabilitiesNoncurrent (8,870)us-gaap_DeferredTaxLiabilitiesNoncurrent
Foreign Pension Plans, Defined Benefit [Member]    
Deferred Tax Assets, Net $ 2,953us-gaap_DeferredTaxAssetsNet
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 $ 2,488us-gaap_DeferredTaxAssetsNet
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember