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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]      
Unsecured borrowings $ 0 $ 57,339  
Short-term secured borrowings 104,000 164,000  
Unsecured Borrowings      
IFRS Statement [Line Items]      
Unsecured borrowings 0 $ 57,339 $ 20,000
Unsecured Borrowings | Bottom of range [member]      
IFRS Statement [Line Items]      
Interest rate   1.04403%  
Unsecured Borrowings | Top of range [member]      
IFRS Statement [Line Items]      
Interest rate   2.96453%  
Secured Borrowings      
IFRS Statement [Line Items]      
Short-term secured borrowings $ 104,000 $ 164,000 $ 164,000
Secured Borrowings | Bottom of range [member]      
IFRS Statement [Line Items]      
Interest rate 0.33% 0.35%  
Secured Borrowings | Top of range [member]      
IFRS Statement [Line Items]      
Interest rate 0.40% 0.78%  
Short-term borrowings [member]      
IFRS Statement [Line Items]      
Unsecured borrowings $ 0 $ 57,339  
Short-term secured borrowings 104,000 164,000  
Unused credit lines $ 280,921 $ 242,476