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EMPLOYEE BENEFIT PLAN - SERP (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution     $ 4,450,000 $ 0  
Proceeds from insurance recovery       507,000  
Supplemental Retirement Plan ('SERP')          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets $ 28,657,000   28,657,000   $ 28,476,000
Trading gains (losses), net $ 1,136,000 $ 370,000 $ 178,000 $ 4,006,000