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EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - Multiple employer pension plan - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
EMPLOYEE BENEFIT PLANS    
Interest cost on projected benefit obligation $ 58 $ 64
Expected return on plan assets (73) (117)
Amortization of net losses 24 22
Net periodic benefit cost $ 9 $ (31)