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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors Comp (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Weighted average grant date fair value per unit
Granted (in dollars per unit)			$ 6.03
Intrinsic value of outstanding grants (in dollars)	$ 23,364		$ 23,364		$ 6,409
SERP and Deferred Compensation Plans
Number of units
Balance at the beginning of the period (in units)			760,630
Granted (in units)			12,942
Balance at the end of the period (in units)	773,572		773,572
Other information
Unit-based compensation expense	$ 100	$ 100	$ 200	$ 400
Total unit-based obligation recorded	$ 16,800		$ 16,800
SERP and Deferred Compensation Plans | Phantom Share Units (PSUs)
Weighted average grant date fair value per unit
Balance at the beginning of the period (in dollars per unit)			$ 22.04
Granted (in dollars per unit)			5.99
Balance at the end of the period (in dollars per unit)	$ 21.77		$ 21.77
Intrinsic value of outstanding grants (in dollars)	$ 5,577		$ 5,577		$ 3,408

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Amount of partnership capital allocated for share-based obligations.

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The weighted average fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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