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New accounting standards - Remaining Notional Amount (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
DerivativeFinancialAssets          
Derivative financial instruments - assets       $ 27,778 $ 11,157
Derivative financial instruments - liabilities       $ 9,211 $ 14,675
USD LIBOR          
DerivativeFinancialAssets          
Derivative financial instruments - assets   $ 1,937 $ 3,006    
Derivative financial instruments - liabilities $ 68,768 $ 88,768 $ 400,414