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ACQUISITIONS - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Aug. 02, 2019
Jan. 03, 2019
Wing        
Assets acquired and liabilities assumed        
Mineral interests in proved properties.     $ 58,084  
Mineral interests in unproved properties     84,976  
Receivables     1,867  
Net assets acquired     144,927  
Wing | Preliminary        
Assets acquired and liabilities assumed        
Mineral interests in proved properties.     55,619  
Mineral interests in unproved properties     87,441  
Receivables     1,867  
Net assets acquired     144,927  
Wing | Adjustments        
Assets acquired and liabilities assumed        
Mineral interests in proved properties.     2,465  
Mineral interests in unproved properties     $ (2,465)  
AllDale I and II        
Assets acquired and liabilities assumed        
Cash and cash equivalents $ 900      
Mineral interests in proved properties. 184,032      
Mineral interests in unproved properties 291,190      
Receivables 9,326      
Accounts payable (1,921)      
Net assets acquired 483,527      
Noncontrolling interest fair value       $ 12,300
AllDale I and II | Preliminary        
Assets acquired and liabilities assumed        
Cash and cash equivalents       900
Mineral interests in proved properties.       159,617
Mineral interests in unproved properties       314,084
Receivables       10,602
Accounts payable       (1,921)
Net assets acquired       $ 483,282
AllDale I and II | Adjustments        
Assets acquired and liabilities assumed        
Mineral interests in proved properties. 24,415      
Mineral interests in unproved properties (22,894)      
Receivables $ (1,276) $ 1,300    
Bluegrass Minerals | Cavalier Minerals        
Assets acquired and liabilities assumed        
Noncontrolling ownership interest (as a percent) 4.00%     4.00%