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Property And Equipment (Tables) | 12 Months Ended
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Dec. 31, 2024
Property and Equipment |
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 |  | 2024 |  | 2023
Vessels |  | 15 to 30 years | ​ | $ | 2,383,245 | ​ | $ | 2,406,089
Systems and equipment | ​ | 5 to 15 years | ​ | ​ | 345,093 | ​ | ​ | 337,913
ROVs and trenchers |  | 5 to 10 years | ​ |  | 261,417 | ​ |  | 252,753
Buildings and other |  | 5 to 39 years | ​ |  | 79,000 | ​ |  | 81,816
Total property and equipment | ​ | ​ | ​ | $ | 3,068,755 | ​ | $ | 3,078,571
​

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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