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Long Term Debt - Ultra Resources, Inc. - Second Lien Notes - Additional Information (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 21, 2018
Feb. 28, 2019
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Principal repayment obligation     $ 1,963,656 $ 2,044,035
Ultra Resources, Inc.        
Debt Instrument [Line Items]        
Repurchase price percentage     101.00%  
6.875% Senior, Unsecured Notes Due 2022 | Ultra Resources, Inc.        
Debt Instrument [Line Items]        
Interest payment terms     The 2022 Notes will mature on April 15, 2022. The interest payment dates for the 2022 Notes are April 15 and October 15 of each year. The 2025 Notes will mature on April 15, 2025. The interest payment dates for the 2025 Notes are April 15 and October 15 of each year. Interest will be paid on the Unsecured Notes from the issue date until maturity.  
6.875% Senior, Unsecured Notes Due 2022 | Ultra Resources, Inc. | Exchange Agreement        
Debt Instrument [Line Items]        
Aggregate principal amount of debt issued on exchange   $ 27,000    
Aggregate principal amount of debt exchanged $ 505,000 44,600   505,000
Principal repayment obligation     $ 150,400  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc.        
Debt Instrument [Line Items]        
Redemption price percentage of principal amount     111.00%  
Redemption criteria     if at least 65% of the original principal amount of the Second Lien Notes remains outstanding and the redemption occurs within 180 days of the closing of such equity offering.  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc. | Maximum        
Debt Instrument [Line Items]        
Redemption price percentage of aggregate principal amount     35.00%  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc. | Twelve-Month Period Beginning December 21, 2021        
Debt Instrument [Line Items]        
Redemption price percentage of principal amount     105.50%  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc. | Twelve-Month Period Beginning December 21, 2022        
Debt Instrument [Line Items]        
Redemption price percentage of principal amount     102.75%  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc. | Twelve-Month Period Beginning December 21, 2023        
Debt Instrument [Line Items]        
Redemption price percentage of principal amount     100.00%  
Second Lien Notes, Secured, Due 2024 | Ultra Resources, Inc. | Exchange Agreement        
Debt Instrument [Line Items]        
Aggregate principal amount of debt issued on exchange $ 545,000 $ 27,000    
Aggregate principal amount of debt exchanged       $ 545,000
Principal repayment obligation     $ 575,100  
Maturity date Jul. 12, 2024      
Debt issued on exchange, interest rate 9.00%      
Debt issued on exchange, paid in kind interest rate percentage 2.00%      
Interest payment terms     The interest payment dates for the Second Lien Notes are January 15 and July 15 of each year, commencing on July 15, 2019.