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Borrowings and debt (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Borrowings and debt      
Balance as of January 1, $ 3,138,310 $ 3,518,446 $ 2,211,567
Net (decrease) increase in short-term borrowings and debt (1,212,023) (428,611) 950,259
Proceeds from long-term borrowings and debt 827,732 371,536 609,017
Repayments of long-term borrowings and debt (781,274) (368,843) (256,173)
Payment of lease liabilities (1,114) (1,072) 0
Recognition of lease liabilities   20,979  
Net Increase in lease liabilities 48    
Change in foreign currency 15,853 20,044 1,903
Adjustment of fair value for hedge accounting relationship 826 4,943 753
Other adjustments (3,288) 888 1,120
Balance as of December 31, $ 1,985,070 $ 3,138,310 $ 3,518,446