Restructuring and Other Related Charges (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	$ 40,914	$ 45,847	$ 6,128
Restructuring charges	27,897	45,847	$ 6,128
Accrued restructuring and other related costs	27,600
Severance and Other Personnel Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	26,132	35,965
Severance and Other Personnel Related Costs [Member] | Management Changes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	26,000
Severance and Other Personnel Related Costs [Member] | Owned Subscription Streaming Services Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,900
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,765	$ 9,882
Other Restructuring [Member] | AMC Networks SVOD Organizational Changes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13,000
National Networks [Member] | Severance and Other Personnel Related Costs [Member] | Management Changes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13,500
International And Other [Member] | Severance and Other Personnel Related Costs [Member] | Management Changes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12,500