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Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property and equipment |  |  |
Property and equipment, gross | $ 264,408 | $ 239,165 |
Less-Accumulated depreciation | (147,202) | (129,369) |
Property and equipment, net | 117,206 | 109,796 |
Depreciation expense | 27,900 | 24,500 | $ 22,600
Land |  |  |
Property and equipment |  |  |
Property and equipment, gross | 7,167 | 6,206 |
Transportation equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 113,802 | 106,972 |
Transportation equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated useful life | 1 year |  |
Transportation equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated useful life | 7 years |  |
Machinery and equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 43,386 | 35,575 |
Machinery and equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated useful life | 1 year |  |
Machinery and equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated useful life | 20 years |  |
Computer and telephone equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 23,215 | 20,744 |
Computer and telephone equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated useful life | 1 year |  |
Computer and telephone equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated useful life | 10 years |  |
Buildings and leasehold improvements |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 69,683 | 62,301 |
Buildings and leasehold improvements | Minimum |  |  |
Property and equipment |  |  |
Estimated useful life | 1 year |  |
Buildings and leasehold improvements | Maximum |  |  |
Property and equipment |  |  |
Estimated useful life | 40 years |  |
Furniture and fixtures |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 5,861 | 5,244 |
Furniture and fixtures | Minimum |  |  |
Property and equipment |  |  |
Estimated useful life | 1 year |  |
Furniture and fixtures | Maximum |  |  |
Property and equipment |  |  |
Estimated useful life | 17 years |  |
Construction in progress |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 1,294 | $ 2,123 |

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