PENSION AND POST RETIREMENT BENEFIT PLANS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2011
Components of net periodic pension benefit costs
Service cost	$ 48,000		$ 144,000
Interest cost	2,472,000	2,346,000	7,416,000	7,038,000
Expected return on plan assets	(3,016,000)	(2,789,000)	(9,048,000)	(8,367,000)
Amortization of net loss	450,000	278,000	1,350,000	834,000
Net periodic benefit cost (Gain)	(46,000)	(165,000)	(138,000)	(495,000)
Contribution by employer			4,800,000
Further contributions to defined benefit retirement plan during the fiscal year					$ 400,000