PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total cost	$ 363,968		$ 347,711
Less: accumulated depreciation	(252,220)		(239,189)
Total net book value	111,748	[1]	108,522	[1]	$ 99,794	$ 114,335
Assets held under capital leases (included in the above)	9,060		8,451
Less: accumulated depreciation	(4,062)		(3,556)
Total net book value	4,998		4,895
Land and buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	96,671		92,237
Assets held under capital leases (included in the above)	3,979		3,805
Machinery, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	177,650		164,503
Assets held under capital leases (included in the above)	5,081		4,646
Other equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	28,745		32,314
Software licenses [Member]
Property, Plant and Equipment [Line Items]
Total cost	58,906		55,656
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 1,996		$ 3,001

[1] Reflects property, plant and equipment.