Income Taxes Current and Deferred Amounts of Income Tax Expense Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 74,646us-gaap_CurrentFederalTaxExpenseBenefit	$ 50,628us-gaap_CurrentFederalTaxExpenseBenefit	$ 19,724us-gaap_CurrentFederalTaxExpenseBenefit
State	1,000	2,653	1,468
Total current	75,646us-gaap_CurrentIncomeTaxExpenseBenefit	53,281us-gaap_CurrentIncomeTaxExpenseBenefit	21,192us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(805)	16,409	41,908
State	10,695	9,511	12,386
Total deferred	9,890us-gaap_DeferredIncomeTaxExpenseBenefit	25,920us-gaap_DeferredIncomeTaxExpenseBenefit	54,294us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes	$ 85,536us-gaap_IncomeTaxExpenseBenefit	$ 79,201us-gaap_IncomeTaxExpenseBenefit	$ 75,486us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.