Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following as of December 31, 2017 and 2016 (in thousands except years):

	December 31, 2017			December 31, 2016			Estimated Useful Life
Computer and networking equipment	$	1,292,587		$	1,170,471		3-7
Purchased software	61,276			51,727			3-10
Furniture and fixtures	48,521			41,968			5
Office equipment	26,949			24,497			3-5
Leasehold improvements	152,487			139,991			1-16
Internal-use software	765,162			656,053			2-7
Property and equipment, gross	2,346,982			2,084,707
Accumulated depreciation and amortization	(1,484,447		)	(1,283,690		)
Property and equipment, net	$	862,535		$	801,017