Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue
Total Revenue	$ 256,564	$ 292,326	$ 765,448	$ 820,316
North America
Disaggregation of Revenue
Total Revenue	32,950	51,563	112,826	134,647
Asia Pacific
Disaggregation of Revenue
Total Revenue	202,377	185,194	586,754	582,238
Europe
Disaggregation of Revenue
Total Revenue	21,237	55,569	65,868	103,431
Systems
Disaggregation of Revenue
Total Revenue	201,037	231,454	595,114	641,825
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 55,527	$ 60,872	$ 170,334	$ 178,491

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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+ Details