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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross $ 676,576 $ 688,901  
Accumulated depreciation (391,635) (348,143)  
Impairment (8,470) (1,605)  
Property, plant and equipment, excluding construction in process, net 276,471 339,153  
Property, plant and equipment, net 331,052 372,481  
Depreciation expense 80,642 79,895 $ 79,726
Project costs reclassified to construction in progress 107,600 22,700  
Buildings      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 166,030 182,889  
Leasehold improvements      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 7,755 6,849  
Machinery and equipment      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 459,471 459,272  
Furniture, fixtures and equipment      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 39,413 36,526  
Motor vehicles      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 3,907 3,365  
Construction in process      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, net $ 54,581 $ 33,328