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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors Comp (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Other information
Intrinsic value of outstanding grants (in dollars)	$ 8,263		$ 6,409
SERP and Directors' Compensation Plans
Weighted average grant date fair value per unit
Granted (in dollars per unit)	$ 22.04
Other information
Unit-based compensation expense	$ 40	$ 300
LTIP outstanding (in units)	760,630
Intrinsic value of outstanding grants (in dollars)	$ 4,400
Total unit-based obligation recorded	$ 16,800

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- Definition

Amount of partnership capital allocated for share-based obligations.

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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.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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).

+ References

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- Definition

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

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- Definition

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

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