Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Schedule of Goodwill [Roll Forward]
Balance as of January 1, 2016	$ 1,150,244
Foreign currency translation	2,132
Balance as of March 31, 2016	$ 1,152,376