Revenues - Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Movement in Deferred Revenue
Beginning balance	$ 186,007	$ 218,823
Cash receipts	644,429	736,224
Revenue recognized	(645,817)	(741,059)
Ending balance	184,619	213,988
Advertising, Marketing Services, and Other
Movement in Deferred Revenue
Beginning balance	51,686	67,543
Cash receipts	132,167	141,146
Revenue recognized	(130,545)	(144,172)
Ending balance	53,308	64,517
Circulation
Movement in Deferred Revenue
Beginning balance	134,321	151,280
Cash receipts	512,262	595,078
Revenue recognized	(515,272)	(596,887)
Ending balance	$ 131,311	$ 149,471