BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 831	$ 882	$ 1,662	$ 1,765
Interest cost	1,375	1,318	2,749	2,635
Expected return on plan assets	(3,042)	(2,980)	(6,085)	(5,961)
Amortization of unrecognized net loss	366	(77)	733	(153)
Amortization of prior service cost	2	1	4	2
Net periodic benefit cost	(468)	(856)	(937)	(1,712)
Post-retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	0	0	0	0
Interest cost	22	24	43	51
Expected return on plan assets	0	0	0	0
Amortization of unrecognized net loss	(3)	(3)	(6)	(3)
Amortization of prior service cost	(45)	(45)	(89)	(90)
Net periodic benefit cost	$ (26)	$ (24)	$ (52)	$ (42)