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Derivative instruments - Cash Flow Hedges, Notional Amounts Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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