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Related-party transactions - Summary (Details) - Management and selected employees - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]      
Compensation selected employees $ (7,883) $ (5,232) $ (7,122)
Amounts payable, related party transactions $ (16,198) $ (15,499)