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Defined Benefit Pension Plans Fair Values of Plan Investments by Asset Category (Details) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
$ 10,761us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
$ 11,680us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
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| Cash and Cash Equivalents [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
726us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |
846us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |
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| Guaranteed Insurance Benefit Type [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
7,440us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain |
8,260us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain |
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| Securities (Assets) [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
2,595us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember |
2,574us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember |
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| Fair Value, Inputs, Level 1 [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
726us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
846us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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| Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
726us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
846us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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| Fair Value, Inputs, Level 1 [Member] | Guaranteed Insurance Benefit Type [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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| Fair Value, Inputs, Level 1 [Member] | Securities (Assets) [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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| Fair Value, Inputs, Level 3 [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
10,035us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
10,834us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
7,658us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
| Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
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| Fair Value, Inputs, Level 3 [Member] | Guaranteed Insurance Benefit Type [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
7,440us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
8,260us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
7,658us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GuaranteedInsuranceBenefitTypeDomain / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
| Fair Value, Inputs, Level 3 [Member] | Securities (Assets) [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Fair Value of Plan Assets |
$ 2,595us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
$ 2,574us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
$ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_SecuritiesAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |