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VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Cavalier Minerals - Funding Commitments - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Alliance Minerals        
Variable Interest Entities        
Beginning cumulative commitment fulfilled $ 143,112 $ 95,597 $ 137,077 $ 63,498
Capital contributions - Cash 0 30,184 6,035 61,360
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals   385   1,308
Ending cumulative commitment fulfilled 143,112 126,166 143,112 126,166
Remaining commitment 888 17,834 888 17,834
Total committed 144,000 144,000 144,000 144,000
Bluegrass Minerals        
Variable Interest Entities        
Beginning cumulative commitment fulfilled 5,963 3,983 5,712 2,646
Capital contributions - Cash 0 1,258 251 2,557
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals   16   54
Ending cumulative commitment fulfilled 5,963 5,257 5,963 5,257
Remaining commitment 37 743 37 743
Total committed $ 6,000 $ 6,000 $ 6,000 $ 6,000