VARIABLE INTEREST ENTITIES - Cavalier Minerals Commitments (Details) - Cavalier Minerals - Funding Commitments - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Alliance Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	$ 95,597	$ 30,675	$ 63,498	$ 11,520
Capital contributions - Cash	30,184	16,447	61,360	35,602
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals	385		1,308
Ending cumulative commitment fulfilled	126,166	47,122	126,166	47,122
Remaining commitment	17,834	878	17,834	878
Total committed	144,000	48,000	144,000	48,000
Bluegrass Minerals
Variable Interest Entities
Beginning cumulative commitment fulfilled	3,983	1,627	2,646	480
Capital contributions - Cash	1,258	336	2,557	1,483
Capital contributions - AllDale Minerals' distributions received by Cavalier Minerals	16		54
Ending cumulative commitment fulfilled	5,257	1,963	5,257	1,963
Remaining commitment	743	37	743	37
Total committed	$ 6,000	$ 2,000	$ 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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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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