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Property and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment

Property and equipment, net consists of the following (in thousands):
 
December 31,
 
2019
 
2018
Computer equipment
$
680,160

 
$
493,536

Computer software
59,511

 
58,303

Leasehold and other improvements
125,299

 
74,721

Furniture and fixtures
53,651

 
42,551

Building(1)
—

 
6,551

Construction in progress(1)
6,830

 
10,167

Property and equipment, gross
925,451

 
685,829

Less: Accumulated depreciation
(457,366
)
 
(338,613
)
Property and equipment, net
$
468,085

 
$
347,216



(1)
We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and derecognized $10.6 million in building and construction in progress assets that we were previously deemed to own under the prior lease accounting standards. These assets are recognized under our operating lease right-of-use assets under Topic 842 as of December 31, 2019.

Construction in progress consists primarily of leasehold and other improvements and in-process software development costs. Depreciation expense was $167.9 million, $123.0 million and $93.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.