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COMPENSATION PLANS - SERP and Directors Compensation Activity (Details) - SERP and Directors' Compensation Plans - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Other information |  |  |  |  |
Unit-based compensation expense | $ 100 | $ 400 | $ 400 | $ 1,100 |
Total unit-based obligation recorded | $ 16,300 |  | $ 16,300 |  |
Phantom Share Units (PSUs) |  |  |  |  |
Summary of units |  |  |  |  |
Balance at the beginning of the period (in units) |  |  | 631,365 |  |
Granted (in units) |  |  | 29,544 |  |
Balance at the end of the period (in units) | 660,909 |  | 660,909 |  |
Weighted average grant date fair value per unit |  |  |  |  |
Balance at the beginning of the period (in dollars per unit) |  |  | $ 25.48 |  |
Granted (in dollars per unit) |  |  | 7.87 |  |
Balance at the end of the period (in dollars per unit) | $ 24.69 |  | $ 24.69 |  |
Intrinsic value (in dollars) |  |  |  |  |
Intrinsic value of outstanding grants (in dollars) | $ 1,831 |  | $ 1,831 |  | $ 6,831

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