Goodwill and Acquired Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The change in the carrying amount of goodwill for the three months ended March 31, 2014 was as follows (in thousands):

Balance as of January 1, 2014	$	757,368
Acquisition of Prolexic Technologies, Inc.	293,412
Balance as of March 31, 2014	$	1,050,780

Schedule of Acquired Intangible Assets

Acquired intangible assets that are subject to amortization consist of the following as of March 31, 2014 and December 31, 2013 (in thousands):

	March 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Completed technology	$	92,431	$	(38,631	)	$	53,800	$	65,631	$	(35,476	)	$	30,155
Customer-related intangible assets	173,600		(78,708		)	94,892		115,100		(75,563		)	39,537
Non-compete agreements	8,890		(3,060		)	5,830		7,950		(2,623		)	5,327
Trademarks and trade names	4,200		(1,101		)	3,099		3,400		(990		)	2,410
Acquired license rights	490		(490		)	—		490		(490		)	—
Total	$	279,611	$	(121,990	)	$	157,621	$	192,571	$	(115,142	)	$	77,429