PENSION AND POST RETIREMENT BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
Components of net periodic pension benefit Gain
Interest and service cost	$ 2,166	$ 2,337	$ 6,498	$ 7,011
Expected return on plan assets	(2,897)	(2,961)	(8,691)	(8,883)
Amortization of net loss	977	632	2,931	1,896
Net periodic benefit gain/(loss)	246	8	738	24
Contribution by employer			2,500	2,300		5,200
Further contributions to defined benefit retirement plan during the fiscal year					$ 2,500