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Property and Equipment, Net | 9 Months Ended
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Sep. 30, 2020
Property Plant And Equipment [Abstract] |
Property and Equipment, Net |
9. | Property and Equipment, Net
Property and equipment consisted of the following at September 30, 2020 and December 31, 2019 (in thousands):
|  | September 30, 2020 |  |  | December 31, 2019 |  |  | Useful life (years)
Buildings and leasehold improvements |  | $ | 93,361 |  |  | $ | 81,065 |  |  | 1-15
Furniture and equipment |  |  | 92,199 |  |  |  | 91,720 |  |  | 3-10
Computer systems and equipment |  |  | 173,606 |  |  |  | 164,161 |  |  | 3-10
Construction equipment |  |  | 9,477 |  |  |  | 11,765 |  |  | 5-7
|  |  | 368,643 |  |  |  | 348,711 |  |  |
Accumulated depreciation |  |  | (247,157 | ) |  |  | (225,960 | ) |  |
Property and equipment, net |  | $ | 121,486 |  |  | $ | 122,751 |  |  |
Depreciation expense for the three months ended September 30, 2020 and September 30, 2019 was $9.5 million and $8.9 million, respectively, and $28.9 million and $28.2 million, respectively, for the nine months ended September 30, 2020 and September 30, 2019.

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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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