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EMPLOYEE BENEFIT PLANS (Components of net periodic benefit costs, Defined benefit pension plan) (Details) (Defined benefit pension plan [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Defined benefit pension plan [Member]
    
Components of net periodic benefit costs, Defined benefit pension plan    
Service Cost $ 1,875 $ 1,750
Interest Cost 1,400 1,375
Expected Return on Plan Assets (1,825) (1,700)
Prior Service Cost Amortization 75 100
Net Gain Amortization 1,075 850
Net Periodic Benefit Cost $ 2,600 $ 2,375
Discount Rate 4.25% 5.00%
Long-Term Rate of Return on Assets 8.00% 8.00%