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INVESTMENTS - Kodiak (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Jul. 19, 2017
Changes in investment      
Contributions   $ 100,000  
Ending balance $ 102,800 102,800  
Kodiak | Series A-1 Preferred Interests | Alliance Minerals      
Cost method investments      
Investment in affiliate     $ 100,000
Changes in investment      
Beginning balance 0    
Contributions 100,000    
Payment-in-kind distributions received 2,800    
Ending balance $ 102,800 $ 102,800