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Debt And Interest Expense (Carrying Amounts Of Liability And Equity Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Aug. 15, 2007
Debt Disclosure [Abstract]      
Debt Instrument, Unamortized Discount (Premium), Net $ 686,221 $ 686,221  
deferred tax on debenture discount (267,225) (267,225)  
Carrying amount of equity component (net of issuance costs of $14,449) 418,996 418,996  
Principal amount of debt 1,250,000 1,250,000 $ 1,250,000
Unamortized discount of liability component (612,303) (624,315)  
Unamortized Debt Issuance Expense (10,081) (10,260)  
Carrying amount of liability component 627,616 615,425  
Contingent interest derivative 0 14,339  
Convertible Debt $ 627,616 $ 629,764