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Income Taxes (Provision) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current tax expense:      
Federal $ 87,700,000us-gaap_CurrentFederalTaxExpenseBenefit $ 79,000,000us-gaap_CurrentFederalTaxExpenseBenefit $ (3,400,000)us-gaap_CurrentFederalTaxExpenseBenefit
State (15,000,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 12,500,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit (1,200,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current tax expense 72,700,000us-gaap_CurrentIncomeTaxExpenseBenefit 91,500,000us-gaap_CurrentIncomeTaxExpenseBenefit (4,600,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit):      
Federal 2,400,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 15,000,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 11,100,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (19,000,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (6,400,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (2,200,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred tax expense (benefit) (16,564,000)us-gaap_DeferredIncomeTaxExpenseBenefit 8,645,000us-gaap_DeferredIncomeTaxExpenseBenefit 8,924,000us-gaap_DeferredIncomeTaxExpenseBenefit
Interest expense, gross of related tax effects (1,900,000)us-gaap_OtherTaxExpenseBenefit (300,000)us-gaap_OtherTaxExpenseBenefit 1,700,000us-gaap_OtherTaxExpenseBenefit
Total income tax provision $ 54,163,000us-gaap_IncomeTaxExpenseBenefit $ 99,827,000us-gaap_IncomeTaxExpenseBenefit $ 5,969,000us-gaap_IncomeTaxExpenseBenefit