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Debt And Interest Expense (Carrying Amounts Of Liability And Equity Components) (Details) - USD ($)
$ in Thousands
May 01, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Debt Instrument, Unamortized Discount (Premium), Net   $ 686,221
deferred tax on debenture discount   (267,225)
Carrying amount of equity component (net of issuance costs of $14,449)   418,996
Principal amount of debt $ 1,250,000 1,250,000
Unamortized discount of liability component   (612,303)
Unamortized Debt Issuance Expense   (10,081)
Convertible Debt   $ 627,616