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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Multiple employer pension plan
       
Multiemployer Plans [Line Items]        
Interest cost $ 65 $ 58 $ 130 $ 117
Expected return on plan assets (102) (92) (204) (184)
Amortization of net losses 9 17 18 34
Net periodic benefit $ (28) $ (17) $ (56) $ (33)