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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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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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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		3 Months Ended	12 Months Ended
	Sep. 23, 2018	Mar. 31, 2020	Dec. 31, 2019
Unit-based compensation
Additional common units authorized for issuance	2,500,000
Vesting period		3 years
Authorized issuance of units	4,541,600
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)		739,479
Awarded (in units)		946,638
Unvested at end of period (in units)		1,686,117	739,479
Unvested Weighted Average Grant-Date Fair Value
Unvested at beginning of period (in dollars per unit)		$ 18.059
Awarded (in dollars per unit)		11.540
Unvested at end of period (in dollars per unit)		$ 14.399	$ 18.059
Weighted Average Remaining Contractual Term
Unvested contractual term, at end of period		2 years 3 months 17 days	1 year 4 months 1 day