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Derivative instruments - Cash Flow Hedges, Notional Amounts Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Forward contracts | Cash Flow hedge | Derivatives designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 44,412 | $ 34,843
Call Spread + Coupon-only swap | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 50,000 | 50,000
Call Spread + Coupon-only swap | Cash Flow hedge | Derivatives designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 24,000 | 0
Sustainability-linked ESG Principal Only Swap | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 50,000
Sustainability-linked ESG Principal Only Swap | Cash Flow hedge | Derivatives designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 50,000 | 0
Cross-currency interest rate swap | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 115,439
Cross-currency interest rate swap | Cash Flow hedge | Derivatives designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 80,000 | 100,000
Call spread | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 30,000 | 30,000
Coupon-only swap | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 30,000 | $ 30,000

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