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FIXED ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
FIXED ASSETS          
Total $ 145,895   $ 145,895   $ 138,526
Less: accumulated depreciation (42,656)   (42,656)   (37,510)
Fixed assets, net 103,239   103,239   101,016
Depreciation expense 3,700 $ 3,200 6,800 $ 6,300  
Capitalized interest (Note 4) 200 $ 400 400 $ 700  
Foreign Property, Plant and Equipment, Net 52,100   52,100   33,700
Machinery and laboratory equipment          
FIXED ASSETS          
Total 35,224   35,224   34,309
Leasehold improvements          
FIXED ASSETS          
Total 34,327   34,327   33,787
Computer equipment and software          
FIXED ASSETS          
Total 7,298   7,298   5,623
Office furniture and equipment          
FIXED ASSETS          
Total 1,603   1,603   1,606
Construction in progress          
FIXED ASSETS          
Total $ 67,443   $ 67,443   $ 63,201