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LONG-TERM DEBT, NET (Narrative) (Details) - USD ($)
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 08, 2018
Dec. 31, 2018
Dec. 31, 2019
Aug. 31, 2019
Apr. 30, 2019
Apr. 30, 2018
Feb. 09, 2018
Debt Instrument [Line Items]              
Interest expense $ 5,511,000 $ 43,296,000 $ 61,459,000        
Amortization of debt premium $ 0 (4,512,000) (3,432,000)        
Senior Notes              
Debt Instrument [Line Items]              
Unamortized premium     33,600,000        
7.875% Senior Unsecured Notes Due 2024              
Debt Instrument [Line Items]              
Face value of senior notes issued   500,000,000 500,000,000        
Interest expense     12,000,000.0        
Unamortized premium   29,123,000 0        
Alta Mesa              
Debt Instrument [Line Items]              
Borrowing base           $ 400,000,000.0  
Alta Mesa | 7.875% Senior Unsecured Notes Due 2024              
Debt Instrument [Line Items]              
Face value of senior notes issued     $ 500,000,000.0        
Stated interest rate of senior notes 7.875%   7.875%        
Fair value of senior notes payable     $ 533,600,000        
KFM Credit Facility              
Debt Instrument [Line Items]              
Credit facility amount outstanding   174,000,000 224,000,000        
Alta Mesa Credit Facility              
Debt Instrument [Line Items]              
Maximum credit       $ 200,000,000.0     $ 1,000,000,000.0
Borrowing base     355,900,000   $ 370,000,000.0   $ 350,000,000.0
Installment payment     32,500,000        
Letter of credit outstanding     $ 1,900,000        
Interest rate     10.75%        
Interest rate due to borrowing base deficiency     2.00%        
Interest rate due to default     2.00%        
Alta Mesa Credit Facility | Eurodollar              
Debt Instrument [Line Items]              
Margin interest rate     1.00%        
Alta Mesa Credit Facility | Eurodollar | Minimum              
Debt Instrument [Line Items]              
Margin interest rate     1.00%        
Alta Mesa Credit Facility | Eurodollar | Maximum              
Debt Instrument [Line Items]              
Margin interest rate     2.00%        
Alta Mesa Credit Facility | Federal funds rate              
Debt Instrument [Line Items]              
Margin interest rate     0.50%        
Alta Mesa RBL | Alta Mesa              
Debt Instrument [Line Items]              
Credit facility amount outstanding   $ 161,000,000 $ 355,943,000        
KFM Credit Facility              
Debt Instrument [Line Items]              
Interest rate     6.50%        
Outstanding borrowings     $ 224,000,000.0        
KFM Credit Facility | Eurodollar | Minimum              
Debt Instrument [Line Items]              
Margin interest rate     1.00%        
KFM Credit Facility | Eurodollar | Maximum              
Debt Instrument [Line Items]              
Margin interest rate     2.25%        
KFM Credit Facility | Federal funds rate              
Debt Instrument [Line Items]              
Margin interest rate     0.50%        
KFM Credit Facility | KFM Credit Facility              
Debt Instrument [Line Items]              
Maximum credit     $ 300,000,000.0        
Amendment to KFM Credit Facility              
Debt Instrument [Line Items]              
Maximum credit     $ 15,000,000.0