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Interest Expense (Interest Expense Schedule) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest Expense [Abstract]        
Contractual interest on Convertible Debentures $ 10,156 $ 10,156 $ 20,312 $ 20,312
Contractual interest on Notes 15,234 15,234 30,469 30,469
Amortization of debt discount on the Convertible Debentures 2,971 2,744 5,882 5,433
Credit facility and other interest expense 729 725 1,450 1,449
Total interest expense $ 29,090 $ 28,859 $ 58,113 $ 57,663