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LONG-LIVED ASSETS - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 139,969	$ 131,010
Less-accumulated depreciation and amortization	(85,363)	(79,104)
Property and equipment, net	54,606	51,906
Commitments within construction in progress	1,220
Impairment charge recorded to reduce the carrying value of assets to fair value		183
Gearing
PROPERTY AND EQUIPMENT
Impairment charge recorded to reduce the carrying value of assets to fair value	0
Land
PROPERTY AND EQUIPMENT
Property and equipment, gross	1,982	1,982
Buildings
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 20,874	20,874
Life	39 years
Machinery and equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 98,656	95,546
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	$ 3,648	3,446
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	$ 8,720	8,169
Construction in progress
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 6,089	$ 993

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