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Income Taxes (Schedule Of Income Tax Assets And Liabilities Financial Position) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Current deferred tax asset $ 34,066us-gaap_DeferredTaxAssetsNetCurrent $ 25,315us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred tax liability 241,606us-gaap_DeferredTaxLiabilitiesNoncurrent 227,237us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liability $ 207,540us-gaap_DeferredTaxAssetsLiabilitiesNet $ 201,922us-gaap_DeferredTaxAssetsLiabilitiesNet