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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Loss $ (152,193)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (140,363)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (166,814)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Currency translation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Loss 284us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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6,653us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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12,040us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Pension and Other Postretirement Benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Loss (152,477)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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(147,016)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(178,854)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Pension Liability | Pension and Other Postretirement Benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Loss (144,726)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(139,761)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Postretirement Benefits | Pension and Other Postretirement Benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Loss $ (7,751)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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$ (7,255)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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