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DEFERRED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
DEFERRED COMPENSATION |  |  |  |
Deferred compensation liability |  | $ 0 |  |
Deferred compensation expense |  | $ 1,660 | $ 4,533 |
SERP |  |  |  |
DEFERRED COMPENSATION |  |  |  |
Deferred compensation liability |  |  |  | $ 12,789
Deferred compensation expense | $ 968 |  |  |
Period over which SERP benefit payments to be paid |  | 30 years |  |

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