Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue
Total Revenue	$ 1,017,865	$ 1,130,604	$ 919,998
North America
Disaggregation of Revenue
Total Revenue	144,066	174,810	143,701
Asia Pacific
Disaggregation of Revenue
Total Revenue	781,039	811,308	673,752
Europe
Disaggregation of Revenue
Total Revenue	92,760	144,486	102,545
Systems
Disaggregation of Revenue
Total Revenue	782,559	883,604	692,061
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 235,306	$ 247,000	$ 227,937