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FIXED ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
FIXED ASSETS      
Total $ 156,256 $ 138,526  
Less accumulated depreciation (49,210) (37,510)  
Fixed assets, net 107,046 101,016  
Depreciation expense 13,800 12,800 $ 11,200
Capitalized interest 1,100 1,500 $ 800
Foreign Property, Plant and Equipment, Net 59,800 33,700  
Asset Retirement Obligation 1,500 500  
Increase (Decrease) in Asset Retirement Obligations 500    
Asset Retirement Obligation, Liabilities Incurred 400    
Asset Retirement Obligation, Accretion Expense 100    
Manufacturing and laboratory equipment      
FIXED ASSETS      
Total 39,002 34,309  
Leasehold improvements      
FIXED ASSETS      
Total 34,933 33,787  
Computer equipment and software      
FIXED ASSETS      
Total 7,086 5,623  
Office furniture and equipment      
FIXED ASSETS      
Total 1,603 1,606  
Construction in progress      
FIXED ASSETS      
Total $ 73,632 $ 63,201