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Revenue - Contract liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Revenue            
Contract liabilities $ 202,029 $ 182,540 $ 154,777 $ 122,589 $ 71,549 $ 68,436