Segment Information (Summary of Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues, net	$ 654,015	$ 718,597	$ 2,034,681	$ 2,275,117
Operating income	139,477	168,438	361,249	583,558
Share-based compensation expense	12,394	13,841	43,141	50,465
Depreciation and amortization	27,547	25,619	80,182	75,568
Impairment charges	0	0	130,411	0
Restructuring and other related charges	4,406	10,191	13,879	29,995
Majority-owned equity investees AOI	1,667	1,246	4,361	4,434
Adjusted operating income	185,491	219,335	633,223	744,020
Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	462,149	558,992	1,524,938	1,779,850
Operating income	129,842	182,479	512,598	648,180
Share-based compensation expense	9,922	11,684	34,754	41,774
Depreciation and amortization	13,422	8,048	30,633	24,839
Impairment charges			0
Restructuring and other related charges	5,991	6,199	8,714	6,776
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	159,177	208,410	586,699	721,569
Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	199,292	182,839	530,765	533,454
Operating income	11,198	(11,501)	(147,226)	(52,532)
Share-based compensation expense	2,472	2,157	8,387	8,691
Depreciation and amortization	14,125	17,571	49,549	50,729
Impairment charges			130,411
Restructuring and other related charges	(1,585)	3,992	5,165	23,915
Majority-owned equity investees AOI	1,667	1,246	4,361	4,434
Adjusted operating income	27,877	13,465	50,647	35,237
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	(7,426)	(23,234)	(21,022)	(38,187)
Operating income	(1,563)	(2,540)	(4,123)	(12,090)
Share-based compensation expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment charges			0
Restructuring and other related charges	0	0	0	(696)
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	(1,563)	(2,540)	(4,123)	(12,786)
Inter-segment eliminations | National Networks
Segment Reporting Information [Line Items]
Revenues, net	(7,166)	(18,140)	(17,346)	(29,790)
Inter-segment eliminations | International and Other
Segment Reporting Information [Line Items]
Revenues, net	(260)	(5,094)	(3,676)	(8,397)
Advertising
Segment Reporting Information [Line Items]
Revenues, net	183,102	213,300	617,935	716,569
Advertising | Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	164,216	194,452	564,876	653,031
Advertising | Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	18,923	18,872	53,097	63,613
Advertising | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	(37)	(24)	(38)	(75)
Distribution
Segment Reporting Information [Line Items]
Revenues, net	470,913	505,297	1,416,746	1,558,548
Distribution | Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	297,933	364,540	960,062	1,126,819
Distribution | Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	180,369	163,967	477,668	469,841
Distribution | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	$ (7,389)	$ (23,210)	$ (20,984)	$ (38,112)