Property and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment, net consists of the following (in thousands):

	December 31,
	2018			2017
Computer equipment	$	493,536		$	326,378
Computer software	58,303			46,413
Leasehold and other improvements	74,721			56,232
Furniture and fixtures	42,551			38,789
Building	6,551			7,084
Construction in progress	10,167			5,341
	685,829			480,237
Less: Accumulated depreciation	(338,613		)	(235,113		)
Total property and equipment, net	$	347,216		$	245,124

Construction in progress consists primarily of building, leasehold and other improvements and in-process software development costs. Depreciation expense was $123.0 million, $93.2 million and $67.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.