PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total cost	$ 508,837		$ 502,840
Less: Accumulated depreciation	(319,556)		(304,548)
Total net book value	189,281	[1]	198,292	[1]	192,607	206,310
Assets held under capital leases (included in the above)	8,228		9,518
Less: Accumulated depreciation	(3,026)		(3,741)
Total net book value	5,202		5,777
Land and buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	176,696		174,144
Assets held under capital leases (included in the above)	4,726		4,778
Machinery, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	217,643		214,066
Assets held under capital leases (included in the above)	3,502		4,740
Other equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	43,641		42,680
Software licenses [Member]
Property, Plant and Equipment [Line Items]
Total cost	63,238		60,114
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 7,619		$ 11,836

[1] Reflects property, plant and equipment.