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EMPLOYEE BENEFIT PLANS- Net periodic benefit cost (credit) and related components (Details) (Multiple employer pension plan, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Multiple employer pension plan
       
Multiemployer Plans [Line Items]        
Interest cost $ 65 $ 59 $ 195 $ 176
Expected return on plan assets (103) (93) (307) (277)
Amortization of net losses 9 17 27 51
Net periodic benefit $ (29) $ (17) $ (85) $ (50)