Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue
Total Revenue	$ 292,326	$ 229,175	$ 820,316	$ 653,947
North America
Disaggregation of Revenue
Total Revenue	51,563	36,036	134,647	95,633
Asia Pacific
Disaggregation of Revenue
Total Revenue	185,194	166,342	582,238	484,286
Europe
Disaggregation of Revenue
Total Revenue	55,569	26,797	103,431	74,028
Systems
Disaggregation of Revenue
Total Revenue	231,454	171,092	641,825	488,243
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 60,872	$ 58,083	$ 178,491	$ 165,704