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EMPLOYEE BENEFIT PLAN (Details) (Multiple Employer Retirement Income Plan, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Multiple Employer Retirement Income Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost            
Interest cost 467 479 934 958
Expected return on plan assets (462) (458) (924) (916)
Amortization of net losses 167 116 334 232
Net periodic benefit cost $ 172 $ 137 $ 344 $ 274