VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Cavalier Minerals - Funding Commitments - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Alliance Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	$ 63,498	$ 11,520	$ 0
Capital contributions - Cash	72,334	51,552	11,520
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals	1,245	426
Ending cumulative commitment fulfilled	137,077	63,498	11,520
Remaining commitment	6,923	80,502	36,480
Total committed	144,000	144,000	48,000
Bluegrass Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	2,646	480	0
Capital contributions - Cash	3,014	2,148	480
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals	52	18
Ending cumulative commitment fulfilled	5,712	2,646	480
Remaining commitment	288	3,354	1,520
Total committed	$ 6,000	$ 6,000	$ 2,000

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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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