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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic pension benefit Gain        
Interest and service cost $ 2,138 $ 2,350 $ 4,276 $ 4,700
Expected return on plan assets (3,342) (3,305) (6,684) (6,610)
Amortization of net loss 830 816 1,660 1,632
Net periodic loss/(benefit) $ (374) $ (139) $ (748) $ (278)