Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue and other financial information by reportable segment
Revenue	$ 215,828	$ 195,615	$ 413,029	$ 391,046
Gross margin	105,763	106,738	209,825	215,021
Contract Operations
Revenue and other financial information by reportable segment
Revenue	166,298	163,865	329,954	329,899
Gross margin	97,943	102,478	197,098	207,147
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue	49,530	31,750	83,075	61,147
Gross margin	$ 7,820	$ 4,260	$ 12,727	$ 7,874