BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 882	$ 985	$ 1,765	$ 1,970
Interest cost	1,318	1,028	2,635	2,057
Expected return on plan assets	(2,980)	(2,451)	(5,961)	(4,902)
Amortization of unrecognized net loss	(77)	1,008	(153)	2,015
Amortization of prior service cost	1	14	2	29
Net periodic benefit cost	(856)	584	(1,712)	1,169
Post-retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	0	0	0	0
Interest cost	24	22	51	44
Expected return on plan assets	0	0	0	0
Amortization of unrecognized net loss	(3)	3	(3)	6
Amortization of prior service cost	(45)	(45)	(90)	(90)
Net periodic benefit cost	$ (24)	$ (20)	$ (42)	$ (40)