Segment Information (Summary of Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues, net	$ 646,291	$ 772,299	$ 1,380,666	$ 1,556,520
Operating income	48,802	170,257	221,772	415,120
Share-based compensation expense	15,235	16,725	30,747	36,624
Depreciation and amortization	25,905	25,893	52,635	49,949
Impairment charges	130,411	0	130,411	0
Restructuring and other related charges	3,507	17,162	9,473	19,804
Majority-owned equity investees AOI	1,418	1,608	2,694	3,188
Adjusted operating income	225,278	231,645	447,732	524,685
Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	495,850	604,739	1,062,789	1,220,858
Operating income	187,532	214,198	382,756	465,702
Share-based compensation expense	12,366	13,821	24,832	30,090
Depreciation and amortization	8,822	8,179	17,211	16,791
Impairment charges	0		0
Restructuring and other related charges	1,214	274	2,723	576
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	209,934	236,472	427,522	513,159
Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	160,980	179,526	331,473	350,615
Operating income	(138,973)	(27,284)	(158,424)	(41,031)
Share-based compensation expense	2,869	2,904	5,915	6,534
Depreciation and amortization	17,083	17,714	35,424	33,158
Impairment charges	130,411		130,411
Restructuring and other related charges	2,293	16,888	6,750	19,923
Majority-owned equity investees AOI	1,418	1,608	2,694	3,188
Adjusted operating income	15,101	11,830	22,770	21,772
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	(10,539)	(11,966)	(13,596)	(14,953)
Operating income	243	(16,657)	(2,560)	(9,551)
Share-based compensation expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment charges	0		0
Restructuring and other related charges	0	0	0	(695)
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	243	(16,657)	(2,560)	(10,246)
Inter-segment eliminations | National Networks
Segment Reporting Information [Line Items]
Revenues, net	(8,111)	(10,260)	(10,180)	(11,650)
Inter-segment eliminations | International and Other
Segment Reporting Information [Line Items]
Revenues, net	(2,428)	(1,706)	(3,416)	(3,303)
Advertising
Segment Reporting Information [Line Items]
Revenues, net	202,244	242,976	434,833	503,269
Advertising | Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	187,434	219,490	400,660	458,579
Advertising | Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	14,810	23,535	34,174	44,741
Advertising | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	0	(49)	(1)	(51)
Distribution
Segment Reporting Information [Line Items]
Revenues, net	444,047	529,323	945,833	1,053,251
Distribution | Operating segments | National Networks
Segment Reporting Information [Line Items]
Revenues, net	308,416	385,249	662,129	762,279
Distribution | Operating segments | International and Other
Segment Reporting Information [Line Items]
Revenues, net	146,170	155,991	297,299	305,874
Distribution | Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenues, net	$ (10,539)	$ (11,917)	$ (13,595)	$ (14,902)