Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Business Segment Information
Total assets	$ 2,434,752	$ 2,389,338
Corporate, Eliminations and Other
Business Segment Information
Total assets	49,217	57,049
Well Intervention | Reportable Segments
Business Segment Information
Total assets	1,828,452	1,796,269
Robotics | Reportable Segments
Business Segment Information
Total assets	190,092	192,694
Shallow Water Abandonment | Reportable Segments
Business Segment Information
Total assets	247,317	206,944
Production Facilities | Reportable Segments
Business Segment Information
Total assets	$ 119,674	$ 136,382