PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross $ 139,872 $ 111,878  
Less: Accumulated depreciation 44,041 44,271  
Property, plant and equipment, net 95,831 67,607  
Depreciation expenses 13,670 6,850 4,400
Construction in progress
     
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross   36,797  
Building
     
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 76,458    
Furniture, fixtures, electronic equipment and software
     
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 45,320 47,591  
Transportation equipment
     
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 2,245 2,281  
Leasehold improvements
     
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross $ 15,849 $ 25,209