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Financial risk - Counterparty credit exposures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial assets [line items] |  |
Derivative financial instruments - assets | $ 10,805 | $ 27,778
Derivative financial instruments - fair value liabilities | (28,455) | (9,211)
Derivatives |  |
Disclosure of financial assets [line items] |  |
Notional value | 943,931 | 783,017
Derivative financial instruments - assets | 10,805 | 27,778
Derivative financial instruments - fair value liabilities | (28,455) | (9,211)
Interest rate swaps |  |
Disclosure of financial assets [line items] |  |
Notional value | 60,000 | 145,667
Derivative financial instruments - assets | 1,282 | 1,831
Derivative financial instruments - fair value liabilities | (538) | (1,774)
Cross-currency swaps |  |
Disclosure of financial assets [line items] |  |
Notional value | 883,931 | 565,997
Derivative financial instruments - assets | 9,523 | 25,947
Derivative financial instruments - fair value liabilities | (27,917) | (3,848)
Foreign exchange forwards |  |
Disclosure of financial assets [line items] |  |
Notional value | 0 | 71,353
Derivative financial instruments - assets | 0 | 0
Derivative financial instruments - fair value liabilities | $ 0 | $ (3,589)
Guarantees and other financial credit enhancements |  |
Disclosure of financial assets [line items] |  |
Coverage ratio on loan portfolio | 12.00% | 12.00%

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