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Property And Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property And Equipment | Property and Equipment The following is a summary of the gross components of property and equipment (dollars in thousands):
|  |  | December 31,
| Estimated Useful Life |  | 2018 |  | 2017
Vessels | 15 to 30 years |  | $ | 2,185,409 |  |  | $ | 2,083,267 |
ROVs, trenchers and ROVDrills | 10 years |  | 284,172 |  |  | 298,227 |
Machinery, equipment and leasehold improvements | 5 to 15 years |  | 316,197 |  |  | 314,278 |
Total property and equipment |  |  | $ | 2,785,778 |  |  | $ | 2,695,772 |
In January 2016, we sold our office and warehouse property located in Aberdeen, Scotland for approximately $11 million and entered into a separate agreement with the same party to lease back the facility for a lease term of 15 years with two five-year options to extend the lease at our option. A gain of approximately $7.6 million from the sale of this property is deferred and amortized over the 15-year minimum lease term. See Note 2 for the effect of the adoption of ASC 842 on this deferred gain. In December 2016, we sold the Helix 534 vessel to a third party for approximately $2.8 million, including $0.4 million held in escrow, which was not subsequently realized. We recorded a gain of approximately $1.3 million from the sale, net of selling expenses.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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