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EMPLOYEE BENEFIT PLANS- Net periodic benefit cost (credit) and related components (Details) - Multiple employer pension plan - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Multiemployer Plans [Line Items]    
Interest cost $ 64 $ 63
Expected return on plan assets (117) (125)
Amortization of net losses 22 20
Net periodic benefit (credit) $ (31) $ (42)