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Derivative financial instruments - Composition of the operations to be settled that are part of the liability for hedging derivative instrument (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of derivative financial instruments [Line Items]    
Fair value $ (6,976) $ (18,439)
Interest rate hedge    
Disclosure of derivative financial instruments [Line Items]    
Amount 275,000 275,000
Fair value $ (644) $ (2,635)
October 2022 One    
Disclosure of derivative financial instruments [Line Items]    
Amount 81,666 81,666
LIBOR of three months, Fixed interest rate (as a percent) 2.632% 2.632%
Fair value $ (191) $ (785)
October 2022 One | Minimum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.06% 2.06%
October 2022 One | Maximum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.14% 2.14%
October 2022 Two    
Disclosure of derivative financial instruments [Line Items]    
Amount 74,167 74,167
LIBOR of three months, Fixed interest rate (as a percent) 2.632% 2.632%
Fair value $ (174) $ (712)
October 2022 Two | Minimum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.06% 2.06%
October 2022 Two | Maximum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.14% 2.14%
October 2022 Three    
Disclosure of derivative financial instruments [Line Items]    
Amount 74,167 74,167
LIBOR of three months, Fixed interest rate (as a percent) 0.732% 0.732%
Fair value $ (174) $ (706)
October 2022 Three | Minimum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 0.16% 0.16%
October 2022 Three | Maximum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 0.24% 0.24%
July 2022    
Disclosure of derivative financial instruments [Line Items]    
Amount 45,000 45,000
LIBOR of three months, Fixed interest rate (as a percent) 2.632% 2.632%
Fair value $ (105) $ (432)
July 2022 | Minimum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.06% 2.06%
July 2022 | Maximum    
Disclosure of derivative financial instruments [Line Items]    
LIBOR of three months, Futures, interest rate (as a percent) 2.14% 2.14%