Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Narrative) (Details)

v3.20.2
LONG-TERM DEBT (Narrative) (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2021
May 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jul. 27, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 25, 2019
USD ($)
Debt Instrument [Line Items]                    
Debt issuance costs, net     $ 20,802,000   $ 20,802,000       $ 23,751,000  
Capitalized interest expense, undeveloped properties     500,000 $ 1,000,000.0 700,000 $ 1,800,000        
Amount of debt to be repurchased     200,000,000   200,000,000          
Repayments of debt         323,322,000 345,350,000        
Gain on debt extinguishment     34,257,000 $ 0 49,579,000 $ 0        
Senior notes | Carry value                    
Debt Instrument [Line Items]                    
Carrying value of notes     1,800,000,000   1,800,000,000          
Senior notes | Fair value | Level 1                    
Debt Instrument [Line Items]                    
Carrying value of notes     930,200,000   930,200,000          
Construction loan                    
Debt Instrument [Line Items]                    
Debt issuance costs, net     100,000   100,000          
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Amount of principal repurchased     47,500,000   73,300,000          
Repayments of debt     12,600,000   22,800,000          
Gain on debt extinguishment     34,300,000   49,600,000          
6.625% senior unsecured notes due 2023 | Senior notes                    
Debt Instrument [Line Items]                    
Long-term debt     $ 324,583,000   $ 324,583,000       329,467,000  
Stated interest rate, percent     6.625%   6.625%          
Debt issuance costs, net     $ 2,800,000   $ 2,800,000          
Amount of principal repurchased     4,900,000              
6.000% senior unsecured notes due 2024 | Senior notes                    
Debt Instrument [Line Items]                    
Long-term debt     $ 579,568,000   $ 579,568,000       603,428,000  
Stated interest rate, percent     6.00%   6.00%          
Debt issuance costs, net     $ 6,100,000   $ 6,100,000          
Amount of principal repurchased     16,300,000              
6.375% senior unsecured notes due 2025 | Senior notes                    
Debt Instrument [Line Items]                    
Long-term debt     $ 507,870,000   $ 507,870,000       529,525,000  
Stated interest rate, percent     6.375%   6.375%          
Debt issuance costs, net     $ 8,500,000   $ 8,500,000          
Amount of principal repurchased     13,500,000              
6.375% senior unsecured notes due 2026 | Senior notes                    
Debt Instrument [Line Items]                    
Long-term debt     $ 374,617,000   $ 374,617,000       397,529,000  
Stated interest rate, percent     6.375%   6.375%          
Debt issuance costs, net     $ 3,400,000   $ 3,400,000          
Amount of principal repurchased     12,800,000              
Revolving credit agreement | Revolving credit agreement | Subsequent Event                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity             $ 750,000,000      
Nova Scotia, Amegy, KeyBank | Revolving credit agreement                    
Debt Instrument [Line Items]                    
Credit facility interest rate at the eurodollar rate         2.44%          
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     1,500,000,000   $ 1,500,000,000          
Elected commitment amount   $ 700,000,000.0           $ 1,000,000,000.0   $ 1,200,000,000
Maximum net secured debt to EBITDAX ratio   2.00                
Long-term debt     123,000,000   123,000,000       $ 120,000,000  
Remaining borrowing capacity     252,900,000   252,900,000          
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement | Forecast                    
Debt Instrument [Line Items]                    
Net funded debt to EBITDAX ratio 4.00                  
Nova Scotia, Amegy, KeyBank | Letter of credit | Revolving credit agreement                    
Debt Instrument [Line Items]                    
Credit facility outstanding     $ 324,100,000   $ 324,100,000