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EQUITY INVESTMENTS - AllDale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Feb. 28, 2017
Changes in equity method investment      
Beginning balance $ 138,817    
Equity in income (loss) of affiliates 3,700 $ (27)  
Ending balance 147,052    
AllDale Minerals | ARLP      
Changes in equity method investment      
Beginning balance 138,817 64,509  
Contributions 9,287 20,168  
Equity in income (loss) of affiliates 3,700 (27)  
Distributions received (4,752) (416)  
Ending balance $ 147,052 $ 84,234  
Funding Commitments | All Dale Minerals III | Alliance Minerals      
Equity method investments, additional information      
Investment commitment     $ 30,000