Income Taxes (Schedule of Federal and State Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal, current	$ 25,797us-gaap_CurrentFederalTaxExpenseBenefit	$ 49,022us-gaap_CurrentFederalTaxExpenseBenefit	$ 34,941us-gaap_CurrentFederalTaxExpenseBenefit
State, current	5,019	9,202	6,635
Current	30,816us-gaap_CurrentIncomeTaxExpenseBenefit	58,224us-gaap_CurrentIncomeTaxExpenseBenefit	41,576us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal, deferred	(10,429)	4,879	(327)
State, deferred	(1,775)	857	231
Deferred	$ (12,204)us-gaap_DeferredIncomeTaxExpenseBenefit	$ 5,736us-gaap_DeferredIncomeTaxExpenseBenefit	$ (96)us-gaap_DeferredIncomeTaxExpenseBenefit

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.