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Borrowings and debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Short-Term Borrowings $ 331,585 $ 1,573,663
Short-Term, Debt 49,350 22,000
Short-Term, Lease Liabilities 1,244 1,145
Long-term, Borrowings 475,852 721,963
Long-term Debt 1,109,484 800,770
Long-term, Lease Liabilities 17,555 18,769
Borrowings and debt, net 1,985,070 3,138,310
Borrowing and Debt Principal [Member]    
Short-Term Borrowings 331,585 1,573,663
Short-Term, Debt 49,350 22,000
Short-Term, Lease Liabilities 1,244 1,145
Long-term, Borrowings 477,010 723,419
Long-term Debt 1,116,033 802,676
Long-term, Lease Liabilities 17,555 18,769
Borrowings and debt, net 1,992,777 3,141,672
Prepaid commissions [member]    
Short-Term Borrowings 0 0
Short-Term, Debt 0 0
Short-Term, Lease Liabilities 0 0
Long-term, Borrowings (1,158) (1,456)
Long-term Debt (6,549) (1,906)
Long-term, Lease Liabilities 0 0
Borrowings and debt, net (7,707) (3,362)
Fixed interest rate [member]    
Short-Term Borrowings 55,000 607,500
Short-Term, Debt 0 22,000
Floating interest rate [member]    
Short-Term Borrowings 276,585 966,163
Short-Term, Debt $ 49,350 $ 0