PENSION, OTHER POST RETIREMENT BENEFIT AND PROFIT SHARING PLANS (Details) (Pension Benefits [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Benefits [Member]
Components of net periodic benefit cost:
Service cost	$ 2,592	$ 2,082
Interest cost	2,072	2,028
Expected return on assets	(3,670)	(3,713)
Amortization of unrecognized transition amount	5	5
Recognized prior service cost	(192)	50
Recognized net loss	1,379	578
Net periodic benefit cost	$ 2,186	$ 1,030