Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Secured and Unsecured Notes (Details)

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Long-term Debt - Secured and Unsecured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 11, 2017
Oct. 03, 2017
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 04, 2016
Dec. 31, 2014
Debt Instrument [Line Items]                
Long term debt outstanding       $ 1,932,126,000 $ 2,148,423,000      
Debt extinguishment costs       0 0 $ 47,875,000    
Unamortized deferred financing costs       11,730,000 15,882,000      
Original issue discount       13,434,000 18,584,000      
Repayments of long-term debt       216,659,000 1,369,690,000 $ 739,472,000    
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%  
Long term debt outstanding       $ 625,000,000 625,000,000      
Senior Notes | 6.75% Senior Secured Notes due 2022 | Change of Control                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       101.00%        
Senior Notes | 6.75% Senior Secured Notes due 2022 | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       103.375%        
Senior Notes | 6.75% Senior Secured Notes due 2022 | Debt Instrument, Redemption, Period Two                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       101.688%        
Senior Notes | 6.75% Senior Secured Notes due 2022 | Debt Instrument, Redemption, Period Three                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       100.00%        
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%
Debt instrument issued, percentage of principal               100.00%
Debt extinguishment costs $ 7,996,000              
Unamortized deferred financing costs 5,207,000              
Redemption premium paid 8,500,000              
Repayments of long-term debt 200,000,000              
Senior Notes | 5.75% Senior Unsecured Notes due 2025                
Debt Instrument [Line Items]                
Long term debt outstanding       $ 295,000,000 $ 300,000,000      
Unsecured Notes | Floating Rate Senior Unsecured Notes due 2022                
Debt Instrument [Line Items]                
Debt instrument face amount             $ 525,000,000  
Debt instrument issued, percentage of principal             98.00%  
Debt extinguishment amount 78,792,000 $ 446,208,000            
Long term debt outstanding   78,792,000            
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            
Redemption premium paid 7,091,000              
Unsecured Notes | 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%              
Debt instrument, redemption price percentage 105.75%     100.00%        
Debt instrument, call premium 1.00%              
Repayment of 5.75% note     $ 5,000,000          
Write off of deferred financing costs       $ 55,000        
Write-off of original issue discount       $ 29,000        
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Change of Control                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       101.00%        
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       102.875%        
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Debt Instrument, Redemption, Period Two                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       101.438%        
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Debt Instrument, Redemption, Period Three                
Debt Instrument [Line Items]                
Debt instrument, redemption price percentage       100.00%        
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Minimum | Event of Default                
Debt Instrument [Line Items]                
Potential percentage of principal redeemed         30.00%      
Unsecured Notes | 5.75% Senior Unsecured Notes due 2025 | Maximum | Exercise of Call Option                
Debt Instrument [Line Items]                
Potential percentage of principal redeemed 40.00%              
United States Treasury [Member] | Unsecured Notes | 5.75% Senior Unsecured Notes due 2025                
Debt Instrument [Line Items]                
Variable rate on spread 0.50%