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Financial instruments and derivatives - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Carrying Amount $ 1,199,106 $ 1,244,440
Fair Value $ 1,434,711 $ 1,538,132