Property and Equipment, net

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment, net

5. Property and Equipment, net

The following table summarizes property and equipment, net as of December 31, 2019 and 2018:

	December 31,
	2019			2018
	(in thousands)
Furniture and computer equipment	$	509,120		$	339,761
Site and software development costs	297,252			172,653
Leasehold improvements	228,514			109,929
Construction in progress	45,503			90,104
Buildings (leased - Note 6)	—			184,694
	1,080,389			897,141
Less accumulated depreciation and amortization	(455,845		)	(290,164		)
Property and equipment, net	$	624,544		$	606,977

Property and equipment depreciation and amortization expense was $191.6 million, $122.6 million, and $85.9 million for the years ended December 31, 2019, 2018 and 2017, respectively.