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 9 Months Ended
Sep. 30, 2021
Nov. 02, 2020
USD ($)
Oct. 15, 2020
USD ($)
May 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Nov. 05, 2020
USD ($)
Oct. 08, 2020
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         $ 19,772,000   $ 19,772,000           $ 23,751,000  
Capitalized interest expense, undeveloped properties         200,000 $ 1,000,000.0 900,000 $ 2,800,000            
Amount of debt to be repurchased                         200,000,000  
Repayments of debt             372,484,000 550,500,000            
Gain on debt extinguishment         0 $ 23,600,000 49,579,000 $ 23,600,000            
Subsequent Event                            
Debt Instrument [Line Items]                            
cash on hand                 $ 61,700,000          
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         1,100,000,000   1,100,000,000              
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         0   73,300,000              
Repayments of debt             22,800,000              
Gain on debt extinguishment             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         $ 2,600,000   $ 2,600,000              
6.625% senior unsecured notes due 2023 | Senior Notes | Subsequent Event                            
Debt Instrument [Line Items]                            
Stated interest rate, percent   6.625%                        
Debt instrument, interest   $ 10,800,000                        
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         $ 5,700,000   $ 5,700,000              
6.000% senior unsecured notes due 2024 | Senior Notes | Subsequent Event                            
Debt Instrument [Line Items]                            
Stated interest rate, percent     6.00%                      
Debt instrument, interest     $ 17,400,000                      
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         $ 8,100,000   $ 8,100,000              
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         $ 3,300,000   $ 3,300,000              
Revolving Credit Agreement | Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Elected commitment amount         700,000,000   700,000,000              
Maximum repayment amount                     $ 750,000,000      
Revolving Credit Agreement | Revolving Credit Agreement | Subsequent Event                            
Debt Instrument [Line Items]                            
Elected commitment amount                   $ 580,000,000        
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         279,857,000   279,857,000           $ 120,000,000  
Remaining borrowing capacity         100,100,000   $ 100,100,000              
Nova Scotia, Amegy, KeyBank | Revolving Credit Agreement | Revolving Credit Agreement | Subsequent Event                            
Debt Instrument [Line Items]                            
Long-term debt                 355,500,000          
Remaining borrowing capacity                 0          
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                            
Debt Instrument [Line Items]                            
Credit facility interest rate at the eurodollar rate             2.90%              
Nova Scotia, Amegy, KeyBank | Letter of Credit | Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Credit facility outstanding         $ 320,000,000.0   $ 320,000,000.0              
Nova Scotia, Amegy, KeyBank | Letter of Credit | Revolving Credit Agreement | Subsequent Event                            
Debt Instrument [Line Items]                            
Credit facility outstanding                 $ 243,700,000