Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Notes (Details)

v3.10.0.1
Long-term Debt - Notes (Details) - USD ($)
12 Months Ended
Dec. 11, 2017
Oct. 03, 2017
May 04, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Debt Instrument [Line Items]              
Long term debt outstanding       $ 2,148,423,000 $ 2,270,279,000    
Debt extinguishment costs       0 47,875,000 $ 0  
Unamortized deferred financing costs       15,882,000 21,403,000    
Original issue discount       18,584,000 18,390,000    
Repayments of long-term debt       $ 1,369,690,000 739,472,000 $ 479,059,000  
Senior Notes | 6.75% Senior Secured Notes due 2022              
Debt Instrument [Line Items]              
Debt instrument face amount     $ 625,000,000        
Debt instrument stated interest rate     6.75% 6.75%      
Long term debt outstanding       $ 625,000,000 625,000,000    
Senior Notes | 8.5% Senior Notes due 2022              
Debt Instrument [Line Items]              
Debt instrument face amount             $ 200,000,000
Debt instrument stated interest rate       8.50%     8.50%
Redemption premium paid $ 8,500,000            
Debt instrument issued, percentage of principal             100.00%
Debt extinguishment costs 7,996,000            
Unamortized deferred financing costs 5,207,000            
Repayments of long-term debt 200,000,000            
Unsecured Debt | Floating Rate Senior Unsecured Notes due 2022              
Debt Instrument [Line Items]              
Debt instrument face amount     $ 525,000,000        
Redemption premium paid 7,091,000            
Debt instrument issued, percentage of principal     98.00%        
Long term debt outstanding   $ 78,792,000          
Debt extinguishment amount 78,792,000 446,208,000          
Debt extinguishment costs 6,043,000 32,284,000          
Unamortized deferred financing costs 108,000 696,000          
Original issue discount 1,176,000 $ 7,555,000          
Unsecured Debt | Floating Rate Senior Unsecured Notes due 2022 | LIBOR              
Debt Instrument [Line Items]              
Variable rate on spread     10.75%        
Debt instrument, interest rate floor     1.00%        
Unsecured Debt | 5.75% Senior Unsecured Notes due 2025              
Debt Instrument [Line Items]              
Debt instrument face amount $ 300,000,000            
Debt instrument stated interest rate 5.75%     5.75%      
Debt instrument, redemption price percentage 105.75%     100.00%      
Long term debt outstanding       $ 300,000,000 $ 300,000,000    
Debt instrument, call premium 1.00%            
Unsecured Debt | 5.75% Senior Unsecured Notes due 2025 | U.S. Treasury              
Debt Instrument [Line Items]              
Variable rate on spread 5.00%            
Change of Control | Senior Notes | 6.75% Senior Secured Notes due 2022              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage       101.00%      
Change of Control | Unsecured Debt | 5.75% Senior Unsecured Notes due 2025              
Debt Instrument [Line Items]              
Debt instrument, redemption price percentage       101.00%      
Minimum | Event of Default | Unsecured Debt | 5.75% Senior Unsecured Notes due 2025              
Debt Instrument [Line Items]              
Potential percentage of principal redeemed         30.00%    
Maximum | Exercise of Call Option | Unsecured Debt | 5.75% Senior Unsecured Notes due 2025              
Debt Instrument [Line Items]              
Potential percentage of principal redeemed 40.00%