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Employee Benefit Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Prior service costs $ (443)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax $ (522)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
Net accumulated actuarial net (loss) gain (2,008)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax 1,560us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Accumulated other comprehensive (loss) gain (2,451)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax 1,038us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Net periodic benefit cost in excess of cumulative employer contributions (2,593)us-gaap_PrepaidPensionCosts (2,358)us-gaap_PrepaidPensionCosts
Net amount recognized at December 31, balance sheet (5,044)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet (1,320)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Net (loss) gain arising during period (3,568)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 3,378us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Prior service cost amortization 79us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 79us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Amortization of net actuarial loss 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 31us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Total recognized in other comprehensive (loss) income (3,489)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 3,488us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Total recognized in net periodic pension cost and other comprehensive (loss) income $ 4,449us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax $ (2,315)us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax