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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors (Details) - SERP and Deferred Compensation Plans - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Number of units |  |  |  |
Balance at the beginning of the period (in units) | 742,540 | 668,698 | 760,630 |
Granted (in units) | 118,737 | 73,842 | 46,638 |
Settled (in units) | (49,331) |  | (138,570) |
Balance at the end of the period (in units) | 811,946 | 742,540 | 668,698 |
Weighted average grant date fair value per unit |  |  |  |
Balance at the beginning of the period (in dollars per unit) | $ 20.28 | $ 20.37 | $ 22.04 |
Granted (in dollars per unit) | 20.46 | 19.44 | 9.45 |
Settled (in dollars per unit) | 20.27 |  | 25.86 |
Balance at the end of the period (in dollars per unit) | $ 20.44 | $ 20.28 | $ 20.37 |
Intrinsic value (in dollars) |  |  |  |
Intrinsic value of outstanding grants (in dollars) | $ 17,197 | $ 15,088 | $ 8,452 | $ 3,408
Other information |  |  |  |
Purchased for awards (in shares) | 27,576 |  | 102,962 |
Unit-based compensation expense | $ 2,400 | 1,400 | $ 400 |
Total unit-based obligation recorded | $ 16,600 | $ 15,100 |  |

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