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Property and Equipment, Net | 6 Months Ended
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Jun. 30, 2020
Property Plant And Equipment [Abstract] |
Property and Equipment, Net |
9. | Property and Equipment, Net
Property and equipment consisted of the following at June 30, 2020 and December 31, 2019 (in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |  |  | Useful lives (years)
Buildings and leasehold improvements |  | $ | 91,688 |  |  | $ | 81,065 |  |  | 1-15
Furniture and equipment |  |  | 91,336 |  |  |  | 91,720 |  |  | 3-10
Computer systems and equipment |  |  | 170,484 |  |  |  | 164,161 |  |  | 3-10
Construction equipment |  |  | 9,547 |  |  |  | 11,765 |  |  | 5-7
|  |  | 363,055 |  |  |  | 348,711 |  |  |
Accumulated depreciation |  |  | (238,291 | ) |  |  | (225,960 | ) |  |
Property and equipment, net |  | $ | 124,764 |  |  | $ | 122,751 |  |  |
Depreciation expense for the three months ended June 30, 2020 and June 30, 2019 was $9.8 million and $9.7 million, respectively, and $19.4 million and $19.4 million, respectively, for the six months ended June 30, 2020 and June 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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