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Debt And Interest Expense (Convertible Debentures) (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 01, 2018
Debt Instrument [Line Items]        
Loss on Extinguishment of Debt $ 6,554 $ 0 $ 0  
Convertible Debt, Fair Value Disclosures       $ 651,300
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments 3,770,000      
Convertible Debt, Current $ 0 627,616   644,700
Principal amount of debt   $ 1,250,000   $ 1,250,000
Stock Issued During Period, Shares, Conversion of Convertible Securities 26,080      
Stock Issued During Period, Value, Conversion of Convertible Securities $ 3,170,000      
Discount rate       8.42%