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Related party transactions (Schedule of Related Party Transactions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transactions [Abstract]      
Revenue from related parties $ 6,748 $ 1,613 $ 2,515
Dividends 5,262 267 3,148
Income from transactions with related parties $ 12,010 $ 1,880 $ 5,663