Restructuring and Other Related Charges (Restructuring and Related Costs) (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	$ 27,897	$ 45,847	$ 6,128
Other related charges	13,017	0	0
Total restructuring and other related charges	40,914	45,847	6,128
Intersegment Eliminations [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	(623)	(6,502)	0
National Networks [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	13,453	17,160	(53)
International And Other [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 28,084	$ 35,189	$ 6,181