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Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 17, 2020
May 05, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Senior Notes [Line Items]                
Repayment of 1.50% Senior Convertible Notes due 2021           $ 53,508 $ 0  
Gain on extinguishment of debt     $ 25,070   $ 0 264,546 0  
Senior Notes, net     2,175,038     2,175,038   $ 2,610,298
Senior Unsecured Notes [Member]                
Senior Notes [Line Items]                
Senior Unsecured Notes, exchanged or repurchased face amount $ 611,900              
Senior Unsecured Notes, Redemption Price, Percentage   80.00%            
Senior Notes, Principal amount     1,732,658     1,732,658   2,649,296
Senior Unsecured Notes, unamortized deferred financing costs     15,011     15,011   38,998
Senior Notes, net     1,717,647     1,717,647   2,610,298
Senior Unsecured Notes and 1.50% Senior Unsecured Convertible Notes due 2021 [Member]                
Senior Notes [Line Items]                
Senior Unsecured Notes, exchanged or repurchased face amount 718,911              
Interest Paid, Senior Unsecured Notes, Accrued and Unpaid 8,900              
Senior Unsecured Notes and 1.50% Senior Unsecured Convertible Notes due 2021 [Member] | Accelerated unamortized deferred financing costs [Member]                
Senior Notes [Line Items]                
Gain on Extinguishment of Debt, Non Cash Portion 5,600              
6.125% Senior Unsecured Notes Due 2022 and 5.0% Senior Unsecured Notes Due 2024 [Member]                
Senior Notes [Line Items]                
Senior Unsecured Notes, repurchased settlement amount     65,900     $ 65,900    
Gain on extinguishment of debt     25,100          
Discount realized on extinguishment of debt     25,500          
6.125% Senior Unsecured Notes Due 2022 and 5.0% Senior Unsecured Notes Due 2024 [Member] | Accelerated unamortized deferred financing costs [Member]                
Senior Notes [Line Items]                
Gain on Extinguishment of Debt, Non Cash Portion     $ 480          
6.125% Senior Unsecured Notes due 2022 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage     6.125%     6.125%    
Senior Unsecured Notes, exchanged or repurchased face amount 141,701   $ 62,500 $ 40,700   $ 62,500    
Senior Unsecured Notes, repurchased settlement amount       28,300        
Gain on extinguishment of debt       12,200        
Discount realized on extinguishment of debt       12,400        
Senior Notes, Principal amount     231,881     231,881   476,796
Senior Unsecured Notes, unamortized deferred financing costs     1,055     1,055   2,920
Senior Notes, net     $ 230,826     $ 230,826   473,876
6.125% Senior Unsecured Notes due 2022 [Member] | Accelerated unamortized deferred financing costs [Member]                
Senior Notes [Line Items]                
Gain on Extinguishment of Debt, Non Cash Portion       $ 235        
5.0% Senior Unsecured Notes due 2024 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage     5.00%     5.00%    
Senior Unsecured Notes, exchanged or repurchased face amount 155,339   $ 29,000     $ 29,000    
Senior Notes, Principal amount     315,633     315,633   500,000
Senior Unsecured Notes, unamortized deferred financing costs     1,941     1,941   3,766
Senior Notes, net     $ 313,692     $ 313,692   496,234
5.625% Senior Unsecured Notes due 2025 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage     5.625%     5.625%    
Senior Unsecured Notes, exchanged or repurchased face amount 150,882              
Senior Notes, Principal amount     $ 349,118     $ 349,118   500,000
Senior Unsecured Notes, unamortized deferred financing costs     2,950     2,950   4,903
Senior Notes, net     $ 346,168     $ 346,168   495,097
6.75% Senior Unsecured Notes due 2026 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage     6.75%     6.75%    
Senior Unsecured Notes, exchanged or repurchased face amount 80,765              
Senior Notes, Principal amount     $ 419,235     $ 419,235   500,000
Senior Unsecured Notes, unamortized deferred financing costs     4,145     4,145   5,571
Senior Notes, net     $ 415,090     $ 415,090   494,429
6.625% Senior Unsecured Notes due 2027 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage     6.625%     6.625%    
Senior Unsecured Notes, exchanged or repurchased face amount $ 83,209              
Senior Notes, Principal amount     $ 416,791     $ 416,791   500,000
Senior Unsecured Notes, unamortized deferred financing costs     4,920     4,920   6,601
Senior Notes, net     $ 411,871     $ 411,871   493,399
1.50% Senior Unsecured Convertible Notes Due 2021 [Member]                
Senior Notes [Line Items]                
Senior Notes, interest rate, stated percentage 1.50%   1.50%     1.50%    
Senior Unsecured Notes, exchanged or repurchased face amount $ 107,015              
Repayment of 1.50% Senior Convertible Notes due 2021 53,500              
Interest Expense, Debt         $ 2,800   $ 8,200  
Senior Notes, Principal amount     $ 0     $ 0   172,500
Senior Unsecured Notes, unamortized deferred financing costs     0     0   15,237
Senior Notes, net     $ 0     $ 0   157,263
1.50% Senior Unsecured Convertible Notes due 2021, Unamortized Debt Discount               $ (13,900)
1.50% Senior Unsecured Convertible Notes Due 2021 [Member] | Accelerated unamortized debt discount [Member]                
Senior Notes [Line Items]                
Gain on Extinguishment of Debt, Non Cash Portion $ 6,100