PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Components of Expense, Domestic Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States Pension Plan of US Entity, Defined Benefit [Member]
Components of expense:
Interest cost on benefit obligation	$ 1,830	$ 1,893	$ 1,928
Expected return on plan assets	(2,258)	(2,309)	(2,412)
Recognized net actuarial loss	688	688	792
Curtailment	0	97	157
Net periodic benefit cost	260	369	465
Other Benefits [Member]
Components of expense:
Cost of benefits earned	113	138	137
Interest cost on benefit obligation	165	189	191
Amortization of prior-service costs	(229)	(271)	(316)
Recognized net actuarial loss	56	97	157
Curtailment	0	(149)	0
Net periodic benefit cost	$ 105	$ 4	$ 169