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Pledged assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Pledged Assets [Line items]    
Short-term secured borrowings $ 151,400 $ 104,000
For foundry capacities 2,700  
For customs duties 36 141
Long-term unsecured borrowings 46,500 52,500
Restricted cash and cash equivalents 221,946 175,257
Land [member]    
Pledged Assets [Line items]    
Long-term unsecured borrowings 27,500 27,500
Building and improvements.    
Pledged Assets [Line items]    
Long-term unsecured borrowings $ 40,310 $ 43,616