Goodwill and Acquired Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Finite-lived Intangible Assets Rollforward [Roll Forward]
Finite-Lived Intangible Assets, Net	$ 130,177	$ 141,847
Finite-Lived Intangible Assets, Amortization Expense	(5,726)
Finite-lived intangible assets, other changes	(5,944)
Goodwill	714,499	743,823
Goodwill, Other Increase (Decrease)	(28,850)
Intangible Assets, Net (Including Goodwill)	844,676	$ 885,670
Total intangible assets amortization expense	(5,726)
Total intangible assets, other changes	(34,794)
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year	16,100
Finite-Lived Intangible Asset, Expected Amortization, Year One	20,800
Finite-Lived Intangible Asset, Expected Amortization, Year Two	19,800
Finite-Lived Intangible Asset, Expected Amortization, Year Three	15,300
Finite-Lived Intangible Asset, Expected Amortization, Year Four	9,300
Finite-Lived Intangible Asset, Expected Amortization, Year Five	6,300
Finite-lived Intangible Assets Acquired	0
Goodwill, Acquired During Period	(474)
Total intangible assets acquired during period	$ (474)