Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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.

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

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

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No definition available.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

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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

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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No definition available.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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UNIT-BASED COMPENSATION (Details) - Long-Term Incentive Plan - $ / shares		9 Months Ended	12 Months Ended
	Sep. 23, 2018	Sep. 30, 2019	Dec. 31, 2018
Unit-based compensation
Authorized issuance of units	4,541,600
Additional common units authorized for issuance	2,500,000
Vesting period		3 years
First Anniversary
Unit-based compensation
Vesting percent		33.30%
Second Anniversary
Unit-based compensation
Vesting percent		33.30%
Third Anniversary
Unit-based compensation
Vesting percent		33.30%
Restricted Units
Unvested Units
Unvested at beginning of period (in units)		1,157,924
Vesting (in units)		(182,384)
Unvested at end of period (in units)		975,540	1,157,924
Unvested Weighted Average Grant-Date Fair Value
Unvested at beginning of period (in dollars per unit)		$ 18.054
Vesting (in dollars per unit)		18.737
Unvested at end of period (in dollars per unit)		$ 17.926	$ 18.054
Weighted Average Remaining Contractual Term
Unvested contractual term, at end of period		1 year 6 months 17 days	2 years 8 months 11 days