Restructuring (Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 45,847	$ 6,128	$ 29,503
Intersegment Eliminations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	(6,502)	0	0
National Networks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	17,160	(53)	8,516
International And Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	35,189	$ 6,181	$ 20,987
Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	35,963
Restructuring Plan [Member] | Intersegment Eliminations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0
Restructuring Plan [Member] | National Networks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	17,160
Restructuring Plan [Member] | International And Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	18,803
Distribution Exits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9,884
Distribution Exits [Member] | Intersegment Eliminations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	(6,502)
Distribution Exits [Member] | National Networks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0
Distribution Exits [Member] | International And Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 16,386