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LONG-LIVED ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 143,172	$ 145,734
Less-accumulated depreciation and amortization	(94,085)	(90,041)
Property and equipment, net	49,087	55,693
Commitments within construction in progress	80	132
Land
PROPERTY AND EQUIPMENT
Property and equipment, gross	1,423	1,423
Buildings
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 20,747	22,998
Life	39 years
Machinery and equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 107,469	103,878
Machinery and equipment | Minimum
PROPERTY AND EQUIPMENT
Life	2 years
Machinery and equipment | Maximum
PROPERTY AND EQUIPMENT
Life	10 years
Office furniture and equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 4,387	4,202
Office furniture and equipment | Minimum
PROPERTY AND EQUIPMENT
Life	3 years
Office furniture and equipment | Maximum
PROPERTY AND EQUIPMENT
Life	7 years
Leasehold improvements
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 8,974	9,095
Construction in progress
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 172	$ 4,138

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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