Goodwill and Acquired Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 10,434	$ 9,599
Future amortization expense to be recognized in remainder of 2020	31,400
Future amortization expense 2021	43,000
Future amortization expense 2022	37,300
Future amortization expense 2023	28,900
Future amortization expense 2024	$ 20,500