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Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment consisted of the following at December 31:
(dollars in thousands) |  | Estimated Useful Life in Years |  | 2020 |  | 2019
Land |  | — |  | $ | 9,301 |  |  | $ | 9,301 |
Buildings and improvements |  | 3 to 39 |  | 33,452 |  |  | 29,747 |
Construction equipment |  | 3 to 12 |  | 420,002 |  |  | 403,217 |
Office equipment |  | 3 to 10 |  | 16,725 |  |  | 15,944 |
|  |  |  | 479,480 |  |  | 458,209 |
Less: accumulated depreciation and amortization |  |  |  | (294,366) |  |  | (272,865) |
|  |  |  | $ | 185,114 |  |  | $ | 185,344 |
Construction equipment includes assets under finance leases — see additional information provided in Note 4 — Lease Obligations to the Financial Statements. Depreciation and amortization expense of property and equipment for the years ended December 31, 2020, 2019 and 2018 was $42.9 million, $40.7 million and $38.1 million, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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