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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment (in thousands), together with the related estimated useful lives at December 31, 2018 and 2017, were as follows:
|  | December 31, |  |  |
|  | 2018 |  | 2017 |  | Useful Lives
Land, building and other |  | $ | 15,164 |  | $ | 16,610 |  |  | 3 to 40 years
Recording equipment |  |  | 171,514 |  |  | 183,841 |  |  | 5 to 10 years
Line clearing equipment |  |  | — |  |  | 11 |  |  | 5 years
Vibrator energy sources |  |  | 79,168 |  |  | 79,694 |  |  | 5 to 15 years
Vehicles |  |  | 28,101 |  |  | 27,688 |  |  | 1.5 to 10 years
|  |  | 293,948 |  |  | 307,844 |  |  |
Less accumulated depreciation |  |  | (222,407) |  |  | (221,271) |  |  |
Property and equipment, net |  | $ | 71,541 |  | $ | 86,573 |  |  |

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- References No definition available. + Details
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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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