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Debt and Other Long Term Obligations - Ultra Resources, Inc. - Term Loan - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 29, 2017
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]        
Long-term debt, gross   $ 2,175,000 $ 2,175,000  
Term Loan Secured Due 2024        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 975,000 $ 975,000  
Maturity date   Apr. 12, 2024 Apr. 12, 2024  
Ultra Resources, Inc. | Barclays Bank PLC | Term Loan Secured Due 2024        
Debt Instrument [Line Items]        
Credit Agreement, initial term loan $ 800,000      
Credit Agreement, initial term loan upon emergence from chapter 11 600,000      
Credit Agreement, incremental term loan $ 200,000     $ 175,000
Long-term debt, gross   $ 975,000    
Debt, original issue discount as percentage on principal 1.00%      
Amortization of term loan, quarterly basis   0.25%    
Maturity date   Apr. 12, 2024    
Mandatory prepayment trigger, on asset coverage ratio   200.00%    
Debt instrument, covenant compliance   At March 31, 2018, Ultra Resources was in compliance with all of its debt covenants under the Term Loan Agreement.    
Ultra Resources, Inc. | Barclays Bank PLC | Term Loan Secured Due 2024 | LIBOR        
Debt Instrument [Line Items]        
Variable rate   3.00%    
Ultra Resources, Inc. | Barclays Bank PLC | Term Loan Secured Due 2024 | Base Rate        
Debt Instrument [Line Items]        
Variable rate   2.00%