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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
Net income $ 81,272us-gaap_NetIncomeLoss $ 164,947us-gaap_NetIncomeLoss $ 217,049us-gaap_NetIncomeLoss
Unrealized gains (losses) on marketable securities:      
Unrealized gains (losses) on marketable securities arising during period, net of tax of $1,449, $216, $370 2,417us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (1,097)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 2,009us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: Reclassification adjustment for gains included in net income, net of tax of $(645), $(257), $(201) (1,433)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (447)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (702)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 984us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (1,544)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 1,307us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Defined benefit pension and post-retirement plans:      
Amortization of prior service (benefit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(159), $(134) (295)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1] (276)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1] (233)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]
Other comprehensive income (loss) 689us-gaap_OtherComprehensiveIncomeLossNetOfTax (1,820)us-gaap_OtherComprehensiveIncomeLossNetOfTax 1,074us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 81,961us-gaap_ComprehensiveIncomeNetOfTax $ 163,127us-gaap_ComprehensiveIncomeNetOfTax $ 218,123us-gaap_ComprehensiveIncomeNetOfTax
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."