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Pledged assets
12 Months Ended
Dec. 31, 2018
Pledged Assets [Abstract]  
Disclosure of Pledged Assets [Text Block]
Note 26.
Pledged assets
 
Pledged assets
 
Pledged to secure
 
January 1,
2017
  
December 31,
2017
  
December 31,
2018
 
    
(in thousands)
 
Restricted cash and time deposit
(1)
 Short-term borrowings $138,000   147,000   164,000 
Restricted time deposits
(1)
 For government grants  200   -   326 
Restricted time deposits
(1)
 For customs duties and government grants  124   470   130 
    $
138,324
   
147,470
   
164,456
 
 
(1): The pledged assets are booked as restricted deposits and classified as current or noncurrent by its liquidity.