PENSION AND POST RETIREMENT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits
Components of net periodic benefit cost (credit)
Service cost	$ 342	$ 310	$ 690	$ 627
Interest cost	1,835	2,037	3,678	4,085
Expected return on plan assets	(2,352)	(2,371)	(4,717)	(4,756)
Amortization of prior service cost	(101)	(13)	(204)	(27)
Amortization of transition asset	(67)	(67)	(135)	(135)
Amortization of loss	797	602	1,601	1,213
Net periodic benefit (credit) cost	454	498	913	1,007
Post Retirement Benefits
Components of net periodic benefit cost (credit)
Service cost	4	4	8	8
Interest cost	23	28	46	56
Amortization of prior service cost	(64)	(88)	(128)	(176)
Amortization of loss	(1)	(2)	(2)	(4)
Net periodic benefit (credit) cost	$ (38)	$ (58)	$ (76)	$ (116)