Goodwill and Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of the Changes in the Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 were as follows (in thousands):

	2017		2016
Beginning balance	$	1,228,503	$	1,150,244
Acquisition of Concord Systems, Inc.	—		1,079
Acquisition of Soha Systems, Inc.	—		43,515
Acquisition of Cyberfend, Inc.	—		38,754
Acquisition of Soasta, Inc.	121,668		—
Acquisition of Nominum, Inc.	133,754		—
Measurement period adjustments	4,217		—
Foreign currency translation	10,546		(5,089		)
Ending balance	$	1,498,688	$	1,228,503

Schedule of Acquired Intangible Assets

Acquired intangible assets that are subject to amortization consisted of the following as of December 31, 2017 and 2016 (in thousands):

	December 31, 2017							December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Completed technologies	$	145,091	$	(65,283	)	$	79,808	$	119,091	$	(50,823	)	$	68,268
Customer-related intangible assets	245,310		(128,835		)	116,475		192,810		(114,209		)	78,601
Non-compete agreements	4,710		(3,975		)	735		5,030		(3,775		)	1,255
Trademarks and trade names	7,200		(2,959		)	4,241		3,700		(2,361		)	1,339
Acquired license rights	490		(490		)	—		490		(490		)	—
Total	$	402,801	$	(201,542	)	$	201,259	$	321,121	$	(171,658	)	$	149,463

The following were the identified intangible assets acquired and their respective weighted average useful lives (in thousands, except years):

	Gross Carrying Amount		Weighted Average Useful Life
Completed technologies	$	18,800	4.1
Customer-related intangible assets	28,200		4.6
Trademarks	2,400		4.9
Non-compete agreements	500		1.9
Total	$	49,900

The following were the identified intangible assets acquired and their respective weighted average useful lives (in thousands, except years):

	Gross Carrying Amount		Weighted Average Useful Life
Completed technologies	$	7,200	2.2
Customer-related intangible assets	24,300		6.5
Trademarks	1,100		3.7
Non-compete agreements	200		1.5
Total	$	32,800

The following were the identified intangible assets acquired and their respective weighted average useful lives (in thousands, except years):

	Gross Carrying Amount		Weighted Average Useful Life
Completed technologies	$	25,310	9.8
Customer-related intangible assets	16,560		11.8
Non-compete agreements	80		2.0
Total	$	41,950