Restructuring and Other Related Charges (Summary of Accrued Restructuring and Other Related Costs) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 111,874,000
Charges (credits), net	$ 10,563,000	$ 0	22,537,000	$ 0
Cash payments			(101,590,000)
Non-cash adjustments	(11,916,000)
Other			1,425,000
Ending Balance	22,330,000		22,330,000
Severance and Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			37,150,000
Charges (credits), net			13,444,000
Cash payments			(40,285,000)
Non-cash adjustments	0
Other			(56,000)
Ending Balance	10,253,000		10,253,000
Content Impairments and Other Exit Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			74,724,000
Charges (credits), net			9,093,000
Cash payments			(61,305,000)
Non-cash adjustments	(11,916,000)
Other			1,481,000
Ending Balance	$ 12,077,000		$ 12,077,000