Acquisition - Preliminary Purchase Price (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,373,792		$ 1,984,907
ShowingTime.com, Inc.
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents		$ 14,453
Identifiable intangible assets		111,100
Goodwill		388,885
Other acquired assets		6,006
Deferred tax liability		(3,920)
Other assumed liabilities		(4,751)
Total preliminary estimated purchase price		$ 511,773