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Interest Expense (Interest Expense Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Interest Expense [Abstract]        
Contractual interest on Convertible Debentures $ 10,156 $ 10,156 $ 30,469 $ 30,469
Contractual interest on Notes 15,235 15,235 45,704 39,505
Amortization of debt discount on the Convertible Debentures 2,802 2,581 8,235 7,585
Credit facility and other interest expense 726 572 2,174 1,505
Total interest expense $ 28,919 $ 28,544 $ 86,582 $ 79,064