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Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized prior service cost $ 65us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit $ 78us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit $ 30us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Unrecognized actuarial losses 832us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss 477us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss 858us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
Total recognized in Accumulated Other Comprehensive Income 897us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax 555us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax 888us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
Income tax effect (314)fdef_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTaxEffect (194)fdef_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTaxEffect (311)fdef_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTaxEffect
Net amount recognized in Accumulated Other Comprehensive Income $ 583us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax $ 361us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax $ 577us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax