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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Multiemployer Plans [Line Items]        
Interest cost $ 68 $ 65 $ 137 $ 129
Expected return on plan assets (101) (105) (203) (210)
Amortization of net losses 21 19 42 38
Net periodic benefit $ (12) $ (21) $ (24) $ (43)