UNIT-BASED COMPENSATION - Phantom Units (Details) - Phantom Units	3 Months Ended
Mar. 31, 2020 USD ($) award $ / shares shares
Phantom Units
Unvested at December 31, 2019 (in shares) \| shares	95,248
Vested (in shares) \| shares	(42,814)
Unvested at March 31, 2020 (in shares) \| shares	52,434
Weighted Average Grant-Date Fair Value
Unvested at December 31, 2019 (in dollars per share) \| $ / shares	$ 26.87
Vested (in dollars per share) \| $ / shares	23.24
Unvested at March 31, 2020 (in dollars per share) \| $ / shares	$ 29.83
Aggregate fair value of phantom units vested during period \| $	$ 1,000,000.0
Unrecognized compensation cost related to unvested phantom units \| $	$ 1,100,000
Unrecognized compensation cost related to unvested phantom units, period for recognition	1 year 4 months 28 days
Number of awards impacted \| award	21
Incremental compensation \| $	$ 0

Share-based Compensation Arrangement by Share-based Payment Award, Number Of Awards Impacted

No definition available.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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-Paragraph 2
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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