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Stockholders' Equity AOCI Change (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total accumulated other comprehensive (loss) income $ (45,565)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (18,743)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (21,071)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax (28,485)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax 961us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax  
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, Net of Tax 1,663us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1] 1,367us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1]  
Other Comprehensive (Loss) Income (26,822)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 2,328us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (1,247)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive (Loss) Income, Pension and Other Postretirement Benefit Plans, Net of Tax (35,571)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (14,126)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (18,749)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax (23,108)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 3,256us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, Net of Tax 1,663us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] 1,367us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]  
Other Comprehensive (Loss) Income (21,445)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 4,623us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive (Loss) Income, foreign currency translation (9,994)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 (4,617)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 (2,322)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax (5,377)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 (2,295)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Reclassification from Accumulated Other Comprehensive (Loss) Income, Current Period, Net of Tax 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1] 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Other Comprehensive (Loss) Income $ (5,377)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 $ (2,295)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
[1] See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the year ended December 31, 2014.