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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross $ 717,373 $ 676,576  
Accumulated depreciation (402,792) (391,635)  
Impairment (17,601) (8,470)  
Property, plant and equipment, excluding construction in process, net 296,980 276,471  
Construction in process 165,365 54,581  
Property, plant and equipment, net 462,345 331,052  
Buildings      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 187,179 166,030  
Leasehold improvements      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 9,023 7,755  
Machinery      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 458,624 459,471  
Furniture, fixtures and equipment      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 44,443 39,413  
Motor vehicles      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 4,653 3,907  
Land      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 13,451    
Property, plant and equipment      
PROPERTY, PLANT AND EQUIPMENT, NET      
Depreciation expense $ 72,813 $ 80,642 $ 79,895