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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, 2016
Mar. 31, 2015
Multiemployer Plans [Line Items]    
Interest cost $ 69 $ 64
Expected return on plan assets (102) (105)
Amortization of net losses 21 19
Net periodic benefit (credit) $ (12) $ (22)