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Borrowings and debt (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Long term borrowings Terms [Line Items]    
Total undiscounted lease liabilities $ 24,053 $ 25,967
Short-term 1,244 1,145
Long-term 17,555 18,769
Lease liabilities included in the consolidated statement of financial position 18,799 19,914
2021    
Disclosure of Long term borrowings Terms [Line Items]    
Total undiscounted lease liabilities 2,058 2,005
After 1 year but within 5 years    
Disclosure of Long term borrowings Terms [Line Items]    
Total undiscounted lease liabilities 10,641 10,470
After 5 years but within 10 years    
Disclosure of Long term borrowings Terms [Line Items]    
Total undiscounted lease liabilities $ 11,354 $ 13,492