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Financial Risk (Details 6) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets [line items] |  |
Derivative financial instruments - assets | $ 27,778 | $ 11,157
Derivative financial instruments - liabilities | (9,211) | (14,675)
Derivatives [member] |  |
Disclosure of financial assets [line items] |  |
Notional value | 783,017 | 965,673
Derivative financial instruments - assets | 27,778 | 11,157
Derivative financial instruments - liabilities | (9,211) | (14,675)
Interest rate swaps |  |
Disclosure of financial assets [line items] |  |
Notional value | 145,667 | 521,333
Derivative financial instruments - assets | 1,831 | 407
Derivative financial instruments - liabilities | (1,774) | (1,903)
Cross currency swaps |  |
Disclosure of financial assets [line items] |  |
Notional value | 565,997 | 369,869
Derivative financial instruments - assets | 25,947 | 10,125
Derivative financial instruments - liabilities | (3,848) | (10,197)
Foreign exchange forwards |  |
Disclosure of financial assets [line items] |  |
Notional value | 71,353 | 74,471
Derivative financial instruments - assets | 0 | 625
Derivative financial instruments - liabilities | $ (3,589) | $ (2,575)
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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