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Properties And Equipment | 12 Months Ended
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Dec. 31, 2019
Properties And Equipment [Abstract] |
Properties And Equipment | 12. Properties and Equipment A summary of properties and equipment follows (in thousands):
|  | December 31,
|  | 2019 |  |  | 2018
Land | $ | 8,360 |  | $ | 7,964
Buildings and building improvements |  | 109,404 |  |  | 96,361
Transportation equipment |  | 41,897 |  |  | 51,559
Machinery and equipment |  | 123,102 |  |  | 111,183
Computer software |  | 57,508 |  |  | 49,928
Furniture and fixtures |  | 79,792 |  |  | 72,898
Projects under development |  | 25,840 |  |  | 20,510
Total properties and equipment |  | 445,903 |  |  | 410,403
Less accumulated depreciation |  | (270,140) |  |  | (248,370)
Net properties and equipment | $ | 175,763 |  | $ | 162,033
The net book value of computer software at December 31, 2019 and 2018, was $9.6 million and $6.6 million, respectively. Depreciation expense for computer software was $4.6 million, $5.4 million and $4.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.

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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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