Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Second Lien Notes due 2023 (Details)

v3.20.2
LONG-TERM DEBT - Second Lien Notes due 2023 (Details)
6 Months Ended
Jul. 01, 2018
May 15, 2018
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
Oct. 21, 2019
USD ($)
Oct. 05, 2018
USD ($)
Line of Credit Facility [Line Items]                
Long-term debt     $ 989,171,000   $ 1,118,161,000      
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Maximum debt to EBITDAX ratio under debt covenant               3.50
Second Lien Notes due 2023                
Line of Credit Facility [Line Items]                
Second lien notes               $ 350,000,000.0
Aggregate principal amount of debt repurchased and retired     30,200,000 $ 76,700,000   $ 70,800,000    
Repayments of secured debt     13,500,000          
Second Lien Notes due 2023 | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Long-term debt             $ 200,000,000.0  
Second Lien Notes due 2023 | Exchange Agreement                
Line of Credit Facility [Line Items]                
Second lien notes   $ 344,300,000 $ 4,300,000          
Aggregate principal amount of debt repurchased and retired         $ 10,100,000      
Second Lien Notes due 2023 | Secured Debt                
Line of Credit Facility [Line Items]                
Interest rate   8.50%            
Maximum rate of increase in interest rate   3.00            
Percent of net cash proceeds of asset sales for debt prepayment   100.00%            
Threshold amount of casualty events and condemnations   $ 20,000,000.0            
Redemption price, percentage of principal amount repurchased   101.00%            
Second Lien Notes due 2023 | Secured Debt | From and after May 15, 2018 until May 15, 2021                
Line of Credit Facility [Line Items]                
Redemption price percentage   104.00%            
Second Lien Notes due 2023 | Secured Debt | On and after May 15, 2021 until May 15, 2022                
Line of Credit Facility [Line Items]                
Redemption price percentage   102.00%            
Second Lien Notes due 2023 | Secured Debt | On and after May 15, 2022                
Line of Credit Facility [Line Items]                
Redemption price percentage   100.00%            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio below 2.50 to 1.00                
Line of Credit Facility [Line Items]                
Debt to EBITDAX ratio under debt covenant   2.50            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00                
Line of Credit Facility [Line Items]                
Interest rate increase 1.00%              
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00 | Maximum                
Line of Credit Facility [Line Items]                
Maximum debt to EBITDAX ratio under debt covenant   2.75            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.50 to 1.00 and 2.75 to 1.00 | Minimum                
Line of Credit Facility [Line Items]                
Maximum debt to EBITDAX ratio under debt covenant   2.50            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00                
Line of Credit Facility [Line Items]                
Interest rate increase 2.00%              
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00 | Maximum                
Line of Credit Facility [Line Items]                
Maximum debt to EBITDAX ratio under debt covenant   3.00            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio between 2.75 to 1.00 and 3.00 to 1.00 | Minimum                
Line of Credit Facility [Line Items]                
Maximum debt to EBITDAX ratio under debt covenant   2.75            
Second Lien Notes due 2023 | Secured Debt | Debt to EBITDAX Ratio Greater than or Equal to 3.00 to 1.00                
Line of Credit Facility [Line Items]                
Interest rate increase 3.00%              
8.000% Senior Notes due 2020 | Senior Unsecured Notes                
Line of Credit Facility [Line Items]                
Interest rate   8.00%