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Consolidated Statement of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 5,656us-gaap_NetIncomeLoss $ 20,350us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:    
Amortization of prior service credit included in net periodic cost, net of tax of $(849) and $(867) (1,328)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1] (1,356)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]
Amortization of actuarial loss included in net periodic cost, net of tax of $1,937 and $1,677 3,029us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [1] 2,622us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [1]
Other comprehensive income, net of tax 1,701us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 1,266us-gaap_OtherComprehensiveIncomeLossNetOfTax [1]
Comprehensive income $ 7,357us-gaap_ComprehensiveIncomeNetOfTax [1] $ 21,616us-gaap_ComprehensiveIncomeNetOfTax
[1] Amortization of prior service credit (cost) and amortization of actuarial loss are included in the computation of net periodic cost.