Restructuring and Other Related Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges		$ 27,787	$ 448,966	$ 10,378
Impairment of leasehold improvements	$ 2,500
Accrued restructuring and other related costs		13,734	111,874	340
Accrued liabilities
Restructuring Cost and Reserve [Line Items]
Accrued restructuring and other related costs		12,100	108,000
Other liabilities
Restructuring Cost and Reserve [Line Items]
Accrued restructuring and other related costs		1,600	3,900
2022 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges		27,800	449,000
Restructuring and other related impairment charges	11,600
Operating lease impairment charge	9,100
Impairment of leasehold improvements	$ 2,500
Content Impairments | 2022 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			403,800
Severance and Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges		17,510	45,212
Accrued restructuring and other related costs		$ 8,726	37,150	311
Severance and Employee-Related Costs | 2022 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			$ 45,200
Severance and Employee-Related Costs | November 2020 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges				4,300
Severance and Employee-Related Costs | AMCNI Reporting Unit
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges				$ 6,100