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Debt Exchanges - Additional Information (Details) - Ultra Resources, Inc. - Exchange Agreement - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Feb. 28, 2019
Dec. 31, 2018
Debt Conversion [Line Items]        
Warrants issued on exchange 10,919,499 10,919,499   10,919,499
Warrants exercise price $ 0.01 $ 0.01   $ 0.01
Number of common stock issued upon exercise of each warrant 1 1   1
6.875% Senior, Unsecured Notes Due 2022        
Debt Conversion [Line Items]        
Aggregate principal amount of debt exchanged $ 505.0   $ 44.6 $ 505.0
Aggregate principal amount of debt exchanged, percentage 72.10%     72.10%
Stated interest rate 6.875%      
Debt conversion, original debt, due date, year 2022      
Principal amount of new debt instrument issued for exchange     27.0  
7.125% Senior, Unsecured Notes Due 2025        
Debt Conversion [Line Items]        
Aggregate principal amount of debt exchanged $ 275.0     $ 275.0
Aggregate principal amount of debt exchanged, percentage 55.00%     55.00%
Stated interest rate 7.125%      
Debt conversion, original debt, due date, year 2025      
Senior Secured Second Lien Notes due July 2024        
Debt Conversion [Line Items]        
Principal amount of new debt instrument issued for exchange $ 545.0   $ 27.0  
Debt issued on exchange, paid in kind interest rate percentage 2.00%      
Debt issued on exchange, interest rate 9.00%      
Debt issued on exchange, maturity date 2024-07