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EQUITY INVESTMENTS - AllDale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 28, 2017
Changes in equity method investment        
Beginning balance $ 64,509      
Equity in income (loss) of affiliates 3,543 $ (49,046) $ (16,648)  
Ending balance $ 138,817 64,509    
AllDale Minerals        
Equity method investments, additional information        
Percentage added to cumulative contributions for initial limited partner distributions 25.00%      
Percentage of effective internal rate of return to limited partners for initial distributions 10.00%      
Percentage of incentive distributions to general partner after initial distributions 20.00%      
Percentage of distributions to limited partners after initial distributions 80.00%      
AllDale Minerals | ARLP        
Changes in equity method investment        
Beginning balance $ 64,509 11,257 0  
Contributions 76,797 54,290 11,626  
Equity in income (loss) of affiliates 3,543 (594) (369)  
Distributions received (6,032) (444)    
Ending balance $ 138,817 $ 64,509 $ 11,257  
Funding Commitments | All Dale Minerals III | Alliance Minerals        
Equity method investments, additional information        
Investment commitment       $ 30,000