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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property and Equipment |
Property and Equipment | Note 6—Property and Equipment The following is a summary of property and equipment at December 31 (in thousands):
|  | 2018 |  | 2017 |  | Useful Life |
Land and buildings |  | $ | 101,170 |  | $ | 82,755 |  | Buildings 30 Years |
Leasehold improvements |  |  | 13,438 |  |  | 12,601 |  | Various* |
Office equipment |  |  | 9,669 |  |  | 8,888 |  | 3 - 5 Years |
Construction equipment |  |  | 439,875 |  |  | 392,454 |  | 3 - 7 Years |
Transportation equipment |  |  | 112,170 |  |  | 101,855 |  | 3 - 18 Years |
Solar equipment |  |  | 21,304 |  |  | — |  | 25 years |
Construction in progress |  |  | 35,094 |  |  | 16,336 |  |  |
|  |  | 732,720 |  |  | 614,889 |  |  |
Less: accumulated depreciation and amortization |  |  | (356,836) |  |  | (303,112) |  |  |
Property and equipment, net |  | $ | 375,884 |  | $ | 311,777 |  |  |
* Leasehold improvements are depreciated over the shorter of the life of the leasehold improvement or the lease term.

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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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