PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2016		Dec. 31, 2015		Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total cost	$ 367,410		$ 347,711
Less: accumulated depreciation	(257,986)		(239,189)
Total net book value	109,424	[1]	108,522	[1]	$ 109,237	$ 114,335
Assets held under capital leases (included in the above)	9,064		8,451
Less: accumulated depreciation	(4,220)		(3,556)
Total net book value	4,844		4,895
Land and buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	95,153		92,237
Assets held under capital leases (included in the above)	3,901		3,805
Machinery, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	180,244		164,503
Assets held under capital leases (included in the above)	5,163		4,646
Other equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	29,469		32,314
Software licenses [Member]
Property, Plant and Equipment [Line Items]
Total cost	61,019		55,656
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 1,525		$ 3,001

[1] 1) Reflects property, plant and equipment.