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Related Parties - Purchase of Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2016
Senior Unsecured Notes        
Gain on debt extinguishment   $ 8,878 $ 99,530  
Minimum | Magnetar Capital and Affiliates | Beneficial owner        
Senior Unsecured Notes        
Beneficial ownership interest (as a percent) 5.00%      
Minimum | Blackstone Group Management L.L.C. and Affiliates | Beneficial owner        
Senior Unsecured Notes        
Beneficial ownership interest (as a percent) 5.00%      
Senior notes        
Senior Unsecured Notes        
Aggregate principal amount repurchased       $ 190,900
Gain on debt extinguishment       99,500
2023 Notes | Senior notes | Beneficial owner        
Senior Unsecured Notes        
Aggregate principal amount repurchased $ 100,000     100,000
Purchased amount       $ 46,500
Gain on debt extinguishment 48,300      
2023 Notes | Senior notes | Magnetar Capital and Affiliates | Beneficial owner        
Senior Unsecured Notes        
Aggregate principal amount repurchased 50,000      
Purchased amount 23,300      
2023 Notes | Senior notes | Blackstone Group Management L.L.C. and Affiliates | Beneficial owner        
Senior Unsecured Notes        
Aggregate principal amount repurchased 50,000      
Purchased amount $ 23,300