FAIR VALUE MEASUREMENTS - Changes in Fair Value of the Partnership's Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Derivative Instruments	$ 838	$ 0
Liabilities:
Derivative Instruments	8,327	0
Fair Value, Recurring \| Fair Value, Inputs, Level 1
Assets:
Investment	9,237	19,357
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	0	0
Fair Value, Recurring \| Fair Value, Inputs, Level 2
Assets:
Investment	0	0
Derivative Instruments	838	0
Liabilities:
Derivative Instruments	8,327	0
Fair Value, Recurring \| Fair Value, Inputs, Level 3
Assets:
Investment	0	0
Derivative Instruments	0	0
Liabilities:
Derivative Instruments	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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Period Type:	instant