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INVESTMENTS - AllDale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Feb. 28, 2017
Changes in equity method investment          
Beginning balance     $ 138,817    
Equity in income (loss) of affiliates $ 3,798 $ 1,105 10,414 $ 1,041  
Ending balance 144,349   144,349    
AllDale Minerals | ARLP          
Changes in equity method investment          
Beginning balance 149,592 96,670 138,817 64,509  
Contributions 3,900 32,181 16,487 65,367  
Equity in income (loss) of affiliates 3,798 1,105 10,414 1,041  
Distributions received (12,941) (1,905) (21,369) (2,866)  
Ending balance $ 144,349 $ 128,051 $ 144,349 $ 128,051  
Funding Commitments | All Dale Minerals III | Alliance Minerals          
Equity method investments, additional information          
Investment commitment         $ 30,000