Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue
Total Revenue	$ 194,544	$ 256,512	$ 387,107	$ 508,883
North America
Disaggregation of Revenue
Total Revenue	34,223	34,373	74,748	79,876
Asia Pacific
Disaggregation of Revenue
Total Revenue	145,628	196,159	280,053	384,376
Europe
Disaggregation of Revenue
Total Revenue	14,693	25,980	32,306	44,631
Systems
Disaggregation of Revenue
Total Revenue	133,288	198,645	270,897	394,076
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 61,256	$ 57,867	$ 116,210	$ 114,807