BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 882	$ 985	$ 2,647	$ 2,955
Interest cost	1,318	1,029	3,953	3,086
Expected return on plan assets	(2,980)	(2,710)	(8,941)	(7,612)
Amortization of unrecognized net loss	(77)	1,008	(230)	3,023
Amortization of prior service cost	1	14	4	43
Net periodic benefit cost	(856)	326	(2,567)	1,495
Post-retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	0	0	0	0
Interest cost	26	22	76	66
Expected return on plan assets	0	0	0	0
Amortization of unrecognized net loss	(2)	3	(5)	9
Amortization of prior service cost	(45)	(45)	(134)	(134)
Net periodic benefit cost	$ (21)	$ (20)	$ (63)	$ (59)