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Comprehensive Income (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Amortization of defined benefit pension items    
Amortization of defined benefit pension items, Prior service cost $ (28)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax [1]  
Amortization of defined benefit pension items, Actuarial losses 473us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax [1]  
Amortization of defined benefit pension items, Total before tax 445us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax  
Amortization of defined benefit pension items, Tax benefit (174)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax  
Amortization of defined benefit pension items, Net of tax $ 271us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax $ 120us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
[1] These amounts were included in the computation of net periodic pension cost. See Note 6 for additional details.