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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
Mar. 31, 2014
Mar. 31, 2013
Multiple employer pension plan
   
Multiemployer Plans [Line Items]    
Interest cost $ 65 $ 59
Expected return on plan assets (102) (92)
Amortization of net losses 9 17
Net periodic benefit $ (28) $ (16)