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Pledged assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accelerated Share Repurchases [Line Items]    
Short-term secured borrowings $ 104,000 $ 164,000
For customs duties and government grants 141 133
Long-term unsecured borrowings 52,500 0
Restricted cash and cash equivalents 104,000 164,000
Land [member] | Unsecured Borrowings    
Accelerated Share Repurchases [Line Items]    
Long-term unsecured borrowings 27,500 0
Building and improvements | Unsecured Borrowings    
Accelerated Share Repurchases [Line Items]    
Long-term unsecured borrowings $ 43,616 $ 0