PENSION AND POST RETIREMENT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Postretirement Benefits
Components of net periodic benefit cost (credit)
Service cost	$ 4	$ 4
Interest cost	23	28
Amortization of prior service cost	(64)	(88)
Amortization of loss (gain)	(1)	(2)
Net periodic cost (benefit)	(38)	(58)
Pension Benefits
Components of net periodic benefit cost (credit)
Service cost	348	317
Interest cost	1,843	2,048
Expected return on plan assets	(2,365)	(2,385)
Amortization of prior service cost	(103)	(14)
Amortization of transition	(68)	(68)
Amortization of loss (gain)	804	611
Net periodic cost (benefit)	$ 459	$ 509