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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other information |  |  |  |
Unit-based compensation expense | $ 1,400 | $ 400 | $ 700 |
Total unit-based obligation recorded | $ 15,100 | $ 13,500 |  |
Phantom Share Units (PSUs) |  |  |  |
Number of units |  |  |  |
Balance at the beginning of the period (in units) | 668,698 | 760,630 | 631,365 |
Granted (in units) | 73,842 | 46,638 | 129,265 |
Issued (in units) |  | (138,570) |  |
Balance at the end of the period (in units) | 742,540 | 668,698 | 760,630 |
Weighted average grant date fair value per unit |  |  |  |
Balance at the beginning of the period (in dollars per unit) | $ 20.37 | $ 22.04 | $ 25.48 |
Granted (in dollars per unit) | 19.44 | 9.45 | 5.25 |
Issued (in dollars per unit) |  | 25.86 |  |
Balance at the end of the period (in dollars per unit) | $ 20.28 | $ 20.37 | $ 22.04 |
Intrinsic value (in dollars) |  |  |  |
Intrinsic value of outstanding grants (in dollars) | $ 15,088 | $ 8,452 | $ 3,408 | $ 6,831
Other information |  |  |  |
Purchased for awards (in shares) | 102,962 |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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