Income Taxes (Schedule of Income Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current, Federal	$ 30,385us-gaap_CurrentFederalTaxExpenseBenefit	$ 93,212us-gaap_CurrentFederalTaxExpenseBenefit	$ 102,695us-gaap_CurrentFederalTaxExpenseBenefit
Current, Foreign	(2,550)us-gaap_CurrentForeignTaxExpenseBenefit	0us-gaap_CurrentForeignTaxExpenseBenefit	0us-gaap_CurrentForeignTaxExpenseBenefit
Current, State	16,270	10,980	14,098
Current, Total	44,105us-gaap_CurrentIncomeTaxExpenseBenefit	104,192us-gaap_CurrentIncomeTaxExpenseBenefit	116,793us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred, Federal	(31,922)	36,369	(79,313)
Deferred, Foreign	(620)	0	0
Deferred, State	(7,740)	(1,336)	(4,474)
Deferred, Total	(40,282)us-gaap_DeferredIncomeTaxExpenseBenefit	35,033us-gaap_DeferredIncomeTaxExpenseBenefit	(83,787)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax (shortfall) benefit of stock options exercised	33,501	4,315	2,530
Valuation Allowance	943	202	3,286
INCOME TAX	$ 38,267us-gaap_IncomeTaxExpenseBenefit	$ 143,742us-gaap_IncomeTaxExpenseBenefit	$ 38,822us-gaap_IncomeTaxExpenseBenefit

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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