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Financial Risk Management - Interest Rate Risk and Currency Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Interest rate risk | Interest rate swaps |  |  |
Financial Risk Management |  |  |
Sensitivity analysis, increase (decrease) in interest rate | 0.10% | 0.10% | 0.10%
Fair value of interest rate swaps / net asset | $ 3,576 |  |
Fair value of interest rate swaps / net liability |  | $ 9,245 |
Increase in fair value due to reasonably possible increase in interest rates | $ 195 | $ 404 | $ 844
Interest rate risk | Floating interest rate |  |  |
Financial Risk Management |  |  |
Percent of variable interest rate exposure hedged | 14.30% | 31.20% |
Principal amount of debt not hedged | $ 797,817 | $ 756,403 |
Interest rate basis | LIBOR or SOFR | LIBOR or SOFR | LIBOR or SOFR
Sensitivity analysis, increase (decrease) in interest rate | 0.10% | 0.10% | 0.10%
Increase (decrease) in profit or loss due to reasonably possible increase in assumption | $ (809) | $ (767) | $ (766)
Currency risk |  |  |
Financial Risk Management |  |  |
Sensitivity analysis, increase (decrease) in EUR/USD exchange rate | 10.00% | 10.00% | 10.00%
Increase (decrease) in profit and cash flows | $ (4,023) | $ (4,243) | $ (4,866)
Currency risk | EUR |  |  |
Financial Risk Management |  |  |
Operating and administrative expenses denominated in euros | 40,226 | 42,426 | $ 48,664
Trade payables and accruals denominated in euros | $ 9,900 | $ 10,030 |

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