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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]      
Unsecured borrowings $ 57,339 $ 20,000  
Secured borrowings 164,000 164,000  
Unused credit lines 242,476 247,295  
Unsecured Borrowings      
IFRS Statement [Line Items]      
Unsecured borrowings 57,339 20,000  
Secured Borrowings      
IFRS Statement [Line Items]      
Secured borrowings 164,000 164,000 $ 147,000
Short-term borrowings [member]      
IFRS Statement [Line Items]      
Unsecured borrowings 57,339 20,000  
Secured borrowings $ 164,000 $ 164,000