Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 1,323,331	$ 1,058,951
Amortized intangible assets, accumulated amortization	(628,823)	(582,597)
Indefinite-lived intangible assets (excluding goodwill)	357
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	357	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	859,620	635,063
Amortized intangible assets, accumulated amortization	(370,338)	(332,622)
Customer Lists
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	288,085	269,629
Amortized intangible assets, accumulated amortization	(136,093)	(132,596)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	175,626	154,259
Amortized intangible assets, accumulated amortization	$ (122,392)	$ (117,379)