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Pledged assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Pledged Assets [Line items]    
Short-term secured borrowings $ 369,300 $ 151,400
For foundry capacities   2,700
For customs duties 32 36
Long-term unsecured borrowings 40,500 46,500
Restricted cash and cash equivalents 434,903 221,946
Land    
Pledged Assets [Line items]    
Long-term unsecured borrowings 27,500 27,500
Building and improvements.    
Pledged Assets [Line items]    
Long-term unsecured borrowings $ 38,071 $ 40,310