Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue
Total Revenue	$ 919,998	$ 662,428	$ 474,560
North America
Disaggregation of Revenue
Total Revenue	143,701	48,715	50,786
Asia Pacific
Disaggregation of Revenue
Total Revenue	673,752	516,105	385,233
Europe
Disaggregation of Revenue
Total Revenue	102,545	97,608	38,541
Systems
Disaggregation of Revenue
Total Revenue	692,061	454,598	293,624
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 227,937	$ 207,830	$ 180,936