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Subsequent Events - Narrative (Details)
12 Months Ended
Mar. 04, 2021
USD ($)
Feb. 09, 2021
USD ($)
$ / shares
Dec. 21, 2020
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]          
Senior notes, net       $ 311,898,000 $ 311,085,000
Covenant liquidity requirement       27,500,000  
Cash and cash equivalents       284,802,000 $ 428,339,000
Minimum          
Subsequent Event [Line Items]          
Covenant liquidity requirement       $ 125,000,000.0  
Senior Unsecured Notes          
Subsequent Event [Line Items]          
Redemption Price       100.00%  
Debt Instrument, Redemption, Period          
Subsequent Event [Line Items]          
Redemption Price       102.094%  
Oaktree          
Subsequent Event [Line Items]          
Warrants issued, percentage of outstanding common stock     0.03    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 24.31  
Oaktree | Maximum          
Subsequent Event [Line Items]          
Ownership Percentage on Exercise of Warrants       0.199  
Subsequent Event          
Subsequent Event [Line Items]          
Extinguishment of Debt, Amount $ 7,100,000        
Warrants issued, percentage of outstanding common stock   0.12      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 26.82      
Subsequent Event | Maximum          
Subsequent Event [Line Items]          
Additional Debt Financing   $ 450,000,000.0      
Subsequent Event | Minimum          
Subsequent Event [Line Items]          
Book value of common equity   360,000,000.0      
Covenant liquidity requirement   125,000,000.0      
Cash and cash equivalents   50,000,000.0      
Proceeds from Issuance of Debt   100,000,000.0      
Subsequent Event | Senior Unsecured Notes | Minimum          
Subsequent Event [Line Items]          
Book value of common equity   275,000,000.0      
Subsequent Event | SSTL, Senior Unsecured and Secured Second Lien Note          
Subsequent Event [Line Items]          
Extinguishment of Debt, Amount   15,500,000      
Debt instrument, face amount   498,100,000      
Subsequent Event | Debt Instrument, Redemption, Period          
Subsequent Event [Line Items]          
Redemption Price 100.00%        
Subsequent Event | Debt Instrument, Redemption, Period          
Subsequent Event [Line Items]          
Redemption Price 102.094%        
Subsequent Event | Oaktree          
Subsequent Event [Line Items]          
Senior notes, net   $ 285,000,000.0      
Subsequent Event | Oaktree | Maximum | Majority Shareholder          
Subsequent Event [Line Items]          
Ownership Percentage on Exercise of Warrants   0.199      
Subsequent Event | Oaktree | Maximum | Regulator          
Subsequent Event [Line Items]          
Ownership Percentage on Exercise of Warrants   0.099      
Subsequent Event | Oaktree | Senior Unsecured Notes          
Subsequent Event [Line Items]          
Debt instrument stated percentage of interest (percentage)   12.00%      
Redemption Price   101.00%      
Percentage Of PIK Interest   0.1325      
Weighted average interest rate (percentage)   7.00%      
Alternate Transaction Fee   $ 35,000,000.0      
Subsequent Event | Oaktree | First Tranche          
Subsequent Event [Line Items]          
Senior notes, net   199,500,000      
Subsequent Event | Oaktree | Second Tranche          
Subsequent Event [Line Items]          
Senior notes, net   $ 85,500,000      
6.375% Senior Notes, Due 2021          
Subsequent Event [Line Items]          
Debt instrument stated percentage of interest (percentage)       6.375%  
6.375% Senior Notes, Due 2021 | Senior Unsecured Notes          
Subsequent Event [Line Items]          
Weighted average interest rate (percentage)       6.375%  
8.375% Senior Secured Notes Due In 2022          
Subsequent Event [Line Items]          
Debt instrument stated percentage of interest (percentage)       8.375%