Property And Equipment (Tables)

12 Months Ended

Dec. 31, 2019

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	2019		2018
Vessels	15 to 30 years	$	2,323,314	$	2,185,409
ROVs, trenchers and ROVDrill	10 years	270,004		284,172
Machinery, equipment and leasehold improvements	5 to 15 years	328,956		316,197
Total property and equipment		$	2,922,274	$	2,785,778