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EQUITY INVESTMENTS - AllDale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Feb. 28, 2017
Changes in equity method investment          
Beginning balance     $ 138,817    
Equity in income (loss) of affiliates $ 2,916 $ (37) 6,616 $ (64)  
Ending balance 149,592   149,592    
AllDale Minerals | ARLP          
Changes in equity method investment          
Beginning balance 147,052 84,234 138,817 64,509  
Contributions 3,300 13,017 12,587 33,185  
Equity in income (loss) of affiliates 2,916 (37) 6,616 (64)  
Distributions received (3,676) (544) (8,428) (960)  
Ending balance $ 149,592 $ 96,670 $ 149,592 $ 96,670  
Funding Commitments | All Dale Minerals III | Alliance Minerals          
Equity method investments, additional information          
Investment commitment         $ 30,000