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Property and Equipment, Net | 9 Months Ended
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Sep. 30, 2021
Property Plant And Equipment [Abstract] |
Property and Equipment, Net |
9. | Property and Equipment, Net
Property and equipment consisted of the following at September 30, 2021 and December 31, 2020 (in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |  |  | Useful life (years)
Buildings and leasehold improvements |  | $ | 99,134 |  |  | $ | 98,151 |  |  | 1-15
Furniture and equipment |  |  | 89,489 |  |  |  | 91,036 |  |  | 3-10
Computer systems and equipment |  |  | 162,245 |  |  |  | 160,305 |  |  | 3-10
Construction equipment |  |  | 6,842 |  |  |  | 8,920 |  |  | 5-7
Construction in progress |  |  | 10,242 |  |  |  | 9,202 |  |  |
|  |  | 367,952 |  |  |  | 367,614 |  |  |
Accumulated depreciation |  |  | (262,057 | ) |  |  | (246,587 | ) |  |
Property and equipment, net |  | $ | 105,895 |  |  | $ | 121,027 |  |  |
Depreciation expense for the three months ended September 30, 2021 and September 30, 2020 was $9.6 million and $9.5 million, respectively, and $28.8 million and $28.9 million, respectively, for the nine months ended September 30, 2021 and September 30, 2020.

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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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