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Property and Equipment, Net | 6 Months Ended
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Jun. 30, 2019
Property Plant And Equipment [Abstract] |
Property and Equipment, Net |
10. | Property and Equipment, Net
Property and equipment consisted of the following at December 31, 2018 and June 30, 2019 (in thousands):
|  | December 31, 2018 |  |  | June 30, 2019 |  |  | Useful lives (years)
Buildings and leasehold improvements |  | $ | 54,348 |  |  | $ | 64,444 |  |  | 1-15
Furniture and equipment |  |  | 81,705 |  |  |  | 87,358 |  |  | 3-10
Computer systems and equipment |  |  | 148,255 |  |  |  | 160,680 |  |  | 3-10
Construction equipment |  |  | 12,074 |  |  |  | 11,785 |  |  | 5-7
Accumulated depreciation |  |  | (204,533 | ) |  |  | (223,333 | ) |  |
Property and equipment, net |  | $ | 91,849 |  |  | $ | 100,934 |  |  |
Depreciation expense for the three months ended June 29, 2018 and June 30, 2019 was $7.9 million and $9.7 million, respectively, and 15.1 million and 19.4 million, respectively, for the six months ended June 29, 2018 and June 30, 2019.

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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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