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The Nature of Expenses - Employee benefits expense summarized by function (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement [line items]      
Employee benefits expense $ 146,494 $ 162,943 $ 146,809
Cost of Revenues      
Statement [line items]      
Employee benefits expense 4,515 6,273 7,856
Operating Expenses      
Statement [line items]      
Employee benefits expense $ 141,979 $ 156,670 $ 138,953