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v3.21.1

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 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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