Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Schedule of Goodwill [Roll Forward]
Balance as of January 1, 2016	$ 1,150,244
Foreign currency translation	(107)
Balance as of June 30, 2016	$ 1,150,137