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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Multiemployer Plans [Line Items]        
Interest cost $ 65 $ 65 $ 129 $ 130
Expected return on plan assets (105) (102) (210) (204)
Amortization of net losses 19 9 38 18
Net periodic benefit $ (21) $ (28) $ (43) $ (56)