Goodwill and Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014 and 2013 were as follows (in thousands):

	2014		2013
Beginning balance	$	757,368	$	723,701
Additions	293,926		35,606
Disposals	—		(1,939		)
Ending balance	$	1,051,294	$	757,368

Schedule of Acquired Intangible Assets

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

	December 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Completed technologies	$	88,331	$	(45,537	)	$	42,794	$	65,631	$	(35,476	)	$	30,155
Customer relationships	173,600		(91,160		)	82,440		115,100		(75,563		)	39,537
Non-compete agreements	8,890		(4,224		)	4,666		7,950		(2,623		)	5,327
Trademarks and trade names	3,700		(1,188		)	2,512		3,400		(990		)	2,410
Acquired license rights	490		(490		)	—		490		(490		)	—
Total	$	275,011	$	(142,599	)	$	132,412	$	192,571	$	(115,142	)	$	77,429