PENSION AND POSTRETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of net periodic benefit cost (credit)
Pension Expense	$ 731	$ 444	$ 1,456	$ 887
Other Postretirement Benefit Expense	8	9	16	18
Pension Benefits
Components of net periodic benefit cost (credit)
Service cost	569	498	1,128	991
Interest cost	1,676	1,678	3,348	3,351
Expected return on plan assets	(2,328)	(2,413)	(4,637)	(4,813)
Amortization of prior service credit	(64)	(82)	(127)	(162)
Amortization of transition asset	(79)	(21)	(156)	(42)
Amortization of loss (gain)	957	784	1,900	1,562
Postretirement Benefits
Components of net periodic benefit cost (credit)
Service cost	3	3	6	6
Interest cost	19	18	38	37
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	0	0	0
Amortization of transition asset	0	0	0	0
Amortization of loss (gain)	$ (14)	$ (12)	$ (28)	$ (25)