Property And Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Summary of gross components of property and equipment

The following is a summary of the gross components of property and equipment (dollars in thousands): 

		December 31,
	Estimated Useful Life	2020		2019
Vessels	15 to 30 years	$	2,349,752	$	2,323,314
ROVs, trenchers and ROVDrill	10 years	263,968		270,004
Machinery, equipment and leasehold improvements	5 to 15 years	335,187		328,956
Total property and equipment		$	2,948,907	$	2,922,274