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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
   June 30,
2019
   December 31,
2018
 
   (In thousands of
U.S. Dollars)
 
Raw materials  $1,256   $6,805 
Work-in-progress   15,696    3,308 
Finished goods   46,175    55,816 
Total inventories  $63,127   $65,929