Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Business Segment Information
Total assets	$ 2,369,334	$ 2,389,338
Corporate, Eliminations and Other
Business Segment Information
Total assets	55,930	57,049
Well Intervention | Reportable Segments
Business Segment Information
Total assets	1,795,612	1,796,269
Robotics | Reportable Segments
Business Segment Information
Total assets	183,986	192,694
Shallow Water Abandonment | Reportable Segments
Business Segment Information
Total assets	205,544	206,944
Production Facilities | Reportable Segments
Business Segment Information
Total assets	$ 128,262	$ 136,382