VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Funding Commitments - Cavalier Minerals - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Alliance Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	$ 137,077	$ 63,498	$ 11,520
Capital contributions - Cash	6,035	72,334	51,552
Capital contributions - Net AllDale Minerals' distributions received by Cavalier Minerals (1)		1,245	426
Ending cumulative commitment fulfilled	143,112	137,077	63,498
Remaining commitment	888	6,923	80,502
Total committed	144,000	144,000	144,000
Bluegrass Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	5,712	2,646	480
Capital contributions - Cash	251	3,014	2,148
Capital contributions - Net AllDale Minerals' distributions received by Cavalier Minerals (1)		52	18
Ending cumulative commitment fulfilled	5,963	5,712	2,646
Remaining commitment	37	288	3,354
Total committed	$ 6,000	$ 6,000	$ 6,000

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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