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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Components of net periodic pension benefit Gain        
Interest and service cost $ 2,350 $ 2,250 $ 7,050 $ 6,750
Expected return on plan assets (3,305) (3,197) (9,915) (9,591)
Amortization of net loss 816 940 2,448 2,820
Net periodic loss/(benefit) $ (139) $ (7) $ (417) $ (21)