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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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