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Interest Expense (Interest Expense Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Interest Expense [Abstract]        
Contractual interest on Convertible Debentures $ 21,766 $ 21,766 $ 65,298 $ 65,297
Contractual interest on Notes 0 0 0 20,015
Amortization of debt discount on the Convertible Debentures 0 0 0 4,236
Credit facility and other interest expense 867 865 2,601 2,663
Total interest expense $ 22,633 $ 22,631 $ 67,899 $ 92,211