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Other supplemental information - cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 106,633 $ 94,255 $ 87,331  
Restricted cash included in other current assets 998   1,117  
Restricted cash included in pension and other assets 10,502   11,023  
Total cash, cash equivalents and restricted cash $ 118,133 $ 104,804 $ 99,471 $ 143,619