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EMPLOYEE BENEFIT PLANS - Components of net periodic cost (benefit) (Details) - Multiple employer pension plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
EMPLOYEE BENEFIT PLANS        
Interest cost $ 58 $ 64 $ 116 $ 128
Expected return on plan assets (73) (118) (146) (235)
Amortization of net losses 24 22 48 44
Net periodic cost (benefit) $ 9 $ (32) $ 18 $ (63)