VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Cavalier Minerals - Funding Commitments - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Alliance Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	$ 143,112	$ 82,977	$ 137,077	$ 63,498
Capital contributions - Cash	0	12,096	6,035	31,176
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals		524		923
Ending cumulative commitment fulfilled	143,112	95,597	143,112	95,597
Remaining commitment	888	48,403	888	48,403
Total committed	144,000	144,000	144,000	144,000
Bluegrass Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	5,963	3,458	5,712	2,646
Capital contributions - Cash	0	504	251	1,299
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals		21		38
Ending cumulative commitment fulfilled	5,963	3,983	5,963	3,983
Remaining commitment	37	2,017	37	2,017
Total committed	$ 6,000	$ 6,000	$ 6,000	$ 6,000

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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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