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Net income per common share - Basic and diluted (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings per share [abstract]    
Basic net income per common share (in usd per share) $ 2.57 $ 4.95
Diluted net income per common share (in usd per share) $ 2.57 $ 4.86