Goodwill and Intangible Assets - Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Intangible assets that are subject to amortization
Cost	$ 1,082,600	$ 1,082,600
Accumulated Amortization	(198,814)	(124,259)
Net Carrying Amount	$ 883,786	958,341
Customer relationships
Intangible assets that are subject to amortization
Amortization Period	12 years
Cost	$ 928,200	928,200
Accumulated Amortization	(154,700)	(96,687)
Net Carrying Amount	$ 773,500	831,513
Content and data
Intangible assets that are subject to amortization
Amortization Period	7 years
Cost	$ 154,400	154,400
Accumulated Amortization	(44,114)	(27,572)
Net Carrying Amount	$ 110,286	$ 126,828