PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Domestic Pension and Postretirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets:
Employer contributions	$ 1,082	$ 0	$ 0
Fair value of plan assets at year end	35,591
United States Pension Plan of US Entity, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	47,468	49,622
Interest cost on benefit obligation	1,830	1,893	1,928
Actuarial (gains)/losses	1,788	(1,520)
Benefits paid	(2,586)	(2,527)
Benefit obligation at year end	48,500	47,468	49,622
Change in plan assets:
Fair value of plan assets at beginning of year	32,013	33,127
Actual return on plan assets	5,082	1,413
Employer contributions	1,082	0
Benefits paid	(2,586)	(2,527)
Fair value of plan assets at year end	35,591	32,013	33,127
Unfunded status at December 31	(12,909)	(15,455)
Other Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	4,094	4,623
Cost of benefits earned (service cost)	113	138	137
Interest cost on benefit obligation	165	189	191
Curtailment gain	0	(451)
Actuarial (gains)/losses	389	(192)
Benefits paid	(213)	(213)
Benefit obligation at year end	4,548	4,094	$ 4,623
Change in plan assets:
Fair value of plan assets at beginning of year	0
Employer contributions	213	213
Benefits paid	(213)	(213)
Fair value of plan assets at year end	0	0
Unfunded status at December 31	$ (4,548)	$ (4,094)