Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Business Segment Information
Total assets	$ 2,355,497	$ 2,326,028
Corporate, Eliminations and Other
Business Segment Information
Total assets	73,363	98,561
Well Intervention | Reportable Segments
Business Segment Information
Total assets	1,769,705	2,012,214
Robotics | Reportable Segments
Business Segment Information
Total assets	172,521	96,249
Shallow Water Abandonment | Reportable Segments
Business Segment Information
Total assets	200,987
Production Facilities | Reportable Segments
Business Segment Information
Total assets	$ 138,921	$ 119,004