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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 14, 2020
Nov. 14, 2019
Aug. 14, 2019
May 15, 2019
Feb. 14, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Variable Interest Entities                
Distributions paid to Partners $ 51,753 $ 69,772 $ 70,153 $ 69,489 $ 69,011 $ 51,753 $ 69,011 $ 278,425
Cavalier Minerals | Alliance Minerals                
Variable Interest Entities                
Contributions           143,112    
Distributions paid to Partners           $ 78,831    
Cavalier Minerals | Bluegrass Minerals                
Variable Interest Entities                
Contributions             5,963  
Distributions paid to Partners             $ 3,284  
Cavalier Minerals | Bluegrass Minerals                
Variable Interest Entities                
Incentive distribution of available cash (as a percent)           25.00%    
Cavalier Minerals | Bluegrass Minerals                
Variable Interest Entities                
Noncontrolling ownership interest (as a percent)           4.00%    
Cavalier Minerals | Alliance Minerals                
Variable Interest Entities                
Ownership interest in VIE (as a percent)           96.00%