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v3.20.4

Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property and Equipment |
Property and Equipment | 7. Property and Equipment Property and equipment consist of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | ​ | ​ | ​ | ​ | ​ |
​ |  | Useful Lives |  | December 31, |
​ |  | in Years |  | 2020 |  | 2019 |
Land |  | — | ​ | $ | 7,167 | ​ | $ | 6,206 | ​
Transportation equipment |  | 1 - 7 | ​ |  | 113,802 | ​ |  | 106,972 | ​
Machinery and equipment |  | 1 - 20 | ​ |  | 43,386 | ​ |  | 35,575 | ​
Computer and telephone equipment |  | 1 - 10 | ​ |  | 23,215 | ​ |  | 20,744 | ​
Buildings and leasehold improvements |  | 1 - 40 | ​ |  | 69,683 | ​ |  | 62,301 | ​
Furniture and fixtures |  | 1 - 17 | ​ | ​ | 5,861 | ​ | ​ | 5,244 | ​
Construction in progress |  | — | ​ |  | 1,294 | ​ |  | 2,123 | ​
​ | ​ | ​ | ​ |  | 264,408 | ​ |  | 239,165 | ​
Less—Accumulated depreciation | ​ | ​ | ​ |  | (147,202) | ​ |  | (129,369) | ​
Property and equipment, net | ​ | ​ | ​ | $ | 117,206 | ​ | $ | 109,796 | ​
​ Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $27.9 million, $24.5 million and $22.6 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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