Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue
Total Revenue	$ 256,512	$ 273,970	$ 508,883	$ 527,990
North America
Disaggregation of Revenue
Total Revenue	34,373	37,918	79,876	83,084
Asia Pacific
Disaggregation of Revenue
Total Revenue	196,159	205,941	384,376	397,044
Europe
Disaggregation of Revenue
Total Revenue	25,980	30,111	44,631	47,862
Systems
Disaggregation of Revenue
Total Revenue	198,645	215,174	394,076	410,372
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 57,867	$ 58,796	$ 114,807	$ 117,618

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