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Interest Expense (Interest Expense Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest Expense [Abstract]    
Contractual interest on Convertible Debentures $ 21,766 $ 21,766
Contractual interest on Notes 0 14,948
Amortization of debt discount on the Convertible Debentures 0 3,161
Credit facility and other interest expense 865 913
Total interest expense $ 22,631 $ 40,788