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Income Taxes (Schedule of Components of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Federal Tax Expense (Benefit) $ 111,047us-gaap_CurrentFederalTaxExpenseBenefit $ (10,137)us-gaap_CurrentFederalTaxExpenseBenefit $ 148,495us-gaap_CurrentFederalTaxExpenseBenefit
Current State Tax Expense (Benefit) 10,882us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,403us-gaap_CurrentStateAndLocalTaxExpenseBenefit 14,443us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit) 13,837us-gaap_CurrentForeignTaxExpenseBenefit 5,104us-gaap_CurrentForeignTaxExpenseBenefit 4,393us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 135,766us-gaap_CurrentIncomeTaxExpenseBenefit (2,630)us-gaap_CurrentIncomeTaxExpenseBenefit 167,331us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred Federal Income Tax Expense (Benefit) 5,036us-gaap_DeferredFederalIncomeTaxExpenseBenefit 154,299us-gaap_DeferredFederalIncomeTaxExpenseBenefit (77,360)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred State Income Tax Expense (Benefit) (1,373)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 17,205us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (11,154)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit) (2,456)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) 1,207us-gaap_DeferredIncomeTaxExpenseBenefit 171,504us-gaap_DeferredIncomeTaxExpenseBenefit (88,514)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax Expense Relating To Uncertain Tax Positions Including Accrued Interest (7,818)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense 9,967us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense 7,241us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Income Tax Expense (Benefit) $ 129,155us-gaap_IncomeTaxExpenseBenefit $ 178,841us-gaap_IncomeTaxExpenseBenefit $ 86,058us-gaap_IncomeTaxExpenseBenefit