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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