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Property And Equipment (Tables) | 12 Months Ended
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Dec. 31, 2022
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 |  | 2022 |  | 2021
Vessels |  | 15 to 30 years | ​ | $ | 2,371,084 | ​ | $ | 2,343,162
ROVs and trenchers |  | 5 to 10 years | ​ |  | 262,763 | ​ |  | 257,274
Machinery, equipment, buildings and other |  | 5 to 39 years | ​ |  | 382,465 | ​ |  | 337,718
Total property and equipment | ​ | ​ | ​ | $ | 3,016,312 | ​ | $ | 2,938,154

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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