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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, 2013
Mar. 31, 2012
Multiple employer pension plan
   
Multiemployer Plans [Line Items]    
Interest cost $ 59 $ 63
Expected return on plan assets (92) (82)
Amortization of net losses 17 15
Net periodic benefit $ (16) $ (4)