Quarterly report pursuant to Section 13 or 15(d)

PENSION AND POST RETIREMENT BENEFIT PLANS (Details)

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PENSION AND POST RETIREMENT BENEFIT PLANS (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2013
Components of net periodic pension benefit Gain            
Interest and service cost $ 2,166,000 $ 2,337,000 $ 4,332,000 $ 4,674,000    
Expected return on plan assets (2,897,000) (2,961,000) (5,794,000) (5,922,000)    
Amortization of net loss 977,000 632,000 1,954,000 1,264,000    
Net periodic benefit gain/(loss) 246,000 8,000 492,000 16,000    
Contribution by employer     1,500,000 2,200,000 5,200,000  
Further contributions to defined benefit retirement plan during the fiscal year           $ 3,500,000