Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Total Revenue	$ 1,130,604	$ 919,998	$ 662,428
North America
Disaggregation of Revenue
Total Revenue	174,810	143,701	48,715
Asia Pacific
Disaggregation of Revenue
Total Revenue	811,308	673,752	516,105
Europe
Disaggregation of Revenue
Total Revenue	144,486	102,545	97,608
Systems
Disaggregation of Revenue
Total Revenue	883,604	692,061	454,598
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 247,000	$ 227,937	$ 207,830