PENSION AND POSTRETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plan
Pension and Postretirement plan
Number of last years of employment in which the employee's compensation is considered for determining benefits			3 years
Components of net periodic expense
Service cost	$ 27	$ 21	$ 53	$ 42
Interest cost	68	66	136	133
Expected return on assets	(82)	(85)	(163)	(170)
Amortization of net (gain) loss	48	11	95	22
Net periodic expense (benefit)	61	13	121	27
Expected contributions during current fiscal year			166
Employer contributions	35		95
Expected benefit payment during the year	309		309
Benefits paid	70		$ 140
Postretirement Welfare Plan
Pension and Postretirement plan
Requisite service period for employees who retire after January 1, 2005 in order to be eligible for retiree medical benefits			20 years
Components of net periodic expense
Service cost	2	2	$ 5	4
Interest cost	13	14	25	29
Amortization of net (gain) loss	(18)	(19)	(36)	(39)
Amortization of prior service cost	(3)	(3)	(6)	(6)
Net periodic expense (benefit)	(6)	$ (6)	(12)	$ (12)
Expected benefit payment during the year	$ 51		$ 51