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 ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Components of net periodic pension benefit Gain    
Interest and service cost $ 2,350 $ 2,250
Expected return on plan assets (3,305) (3,197)
Amortization of net loss 816 940
Net periodic loss/(benefit) $ (139) $ (7)