EMPLOYEE BENEFIT PLANS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 327	$ 371
Interest cost	869	830
Expected return on plan assets	(1,008)	(1,007)
Amortization of prior service cost	0	3
Amortization of losses (gains)	629	933
Net periodic benefit cost	817	1,130
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	12	13
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of losses (gains)	(12)	3
Net periodic benefit cost	$ 2	$ 19