PENSION AND POST RETIREMENT BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of net periodic pension benefit Gain
Interest and service cost	$ 2,375	$ 2,166	$ 4,750	$ 4,332
Expected return on plan assets	(3,108)	(2,897)	(6,216)	(5,794)
Amortization of net loss	610	977	1,220	1,954
Net periodic loss/(benefit)	$ (123)	$ 246	$ (246)	$ 492