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STATEMENTS OF COMPREHENSIVE INCOME STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 109,790us-gaap_NetIncomeLoss $ 99,195us-gaap_NetIncomeLoss $ 96,509us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Change in pension and other postretirement benefit plans liability, net of tax of $1,244, $0, and $0, respectively (1,781)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive loss (1,781)us-gaap_OtherComprehensiveIncomeLossNetOfTax 0us-gaap_OtherComprehensiveIncomeLossNetOfTax 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 108,009us-gaap_ComprehensiveIncomeNetOfTax $ 99,195us-gaap_ComprehensiveIncomeNetOfTax $ 96,509us-gaap_ComprehensiveIncomeNetOfTax