Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Goodwill [Roll Forward]
Balance as of beginning-of-period	$ 626,569	$ 608,903
Goodwill Acquired	0	178,266
Measurement period adjustment, goodwill	635	0
Goodwill impairment	0	(160,600)
Balance as of end-of-period	$ 627,204	$ 626,569