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Financial instruments by category (Narrative) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Financial instruments by category [Abstract]      
Cash on hand $ 17,000 $ 23,000 $ 21,000
Financial liabilities, at fair value $ 661,404,000 $ 797,126,000