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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 116,750us-gaap_NetIncomeLoss $ 94,115us-gaap_NetIncomeLoss $ 84,295us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax      
Unrealized (losses) gains on securities 16,028us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (38,065)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 1,599us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Pension and other postretirement benefits (29,755)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 16,752us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (7,984)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive (loss) income (13,727)us-gaap_OtherComprehensiveIncomeLossNetOfTax (21,313)us-gaap_OtherComprehensiveIncomeLossNetOfTax (6,385)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 103,023us-gaap_ComprehensiveIncomeNetOfTax $ 72,802us-gaap_ComprehensiveIncomeNetOfTax $ 77,910us-gaap_ComprehensiveIncomeNetOfTax