VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Cavalier Minerals - Funding Commitments - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Alliance Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	$ 137,077	$ 63,498
Capital contributions - Cash	6,035	19,080
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals		399
Ending cumulative commitment fulfilled	143,112	82,977
Remaining commitment	888	61,023
Total committed	144,000	144,000
Bluegrass Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	5,712	2,646
Capital contributions - Cash	251	795
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals		17
Ending cumulative commitment fulfilled	5,963	3,458
Remaining commitment	37	2,542
Total committed	$ 6,000	$ 6,000

Cash capital contributions made to investee to fulfill funding commitment.

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Capital contributions in the form of dividends received on behalf of the equity holder by the investee to fulfill funding commitment.

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Cumulative capital cash contributions and capital contributions in the form of distributions received by investee on behalf of the equity holder applied against the equity holders commitment to the investee.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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