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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