Segment Information (Summary of Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues, net	$ 691,741	$ 734,375
Operating income	169,708	172,970
Share-based compensation expense	13,446	15,512
Depreciation and amortization	25,246	26,730
Impairment and other charges	16,055	0
Restructuring and other related charges	8,625	5,966
Cloud computing amortization	264
Majority-owned equity investees AOI	4,635	1,276
Adjusted operating income	237,979	222,454
Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	573,969	611,893
Operating income	216,459	224,600
Share-based compensation expense	5,639	2,724
Depreciation and amortization	13,373	10,951
Impairment and other charges	0
Restructuring and other related charges	2,427	1,482
Cloud computing amortization	0
Majority-owned equity investees AOI	4,635	1,276
Adjusted operating income	242,533	241,033
Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	121,167	124,828
Operating income	(3,162)	4,361
Share-based compensation expense	1,231	609
Depreciation and amortization	4,949	8,896
Impairment and other charges	16,055
Restructuring and other related charges	4,490	3,977
Cloud computing amortization	0
Majority-owned equity investees AOI	0	0
Adjusted operating income	23,563	17,843
Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	(3,395)	(2,346)
Operating income	(43,589)	(55,991)
Share-based compensation expense	6,576	12,179
Depreciation and amortization	6,924	6,883
Impairment and other charges	0
Restructuring and other related charges	1,708	507
Cloud computing amortization	264
Majority-owned equity investees AOI	0	0
Adjusted operating income	(28,117)	(36,422)
Corporate / Inter-segment Eliminations | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	(670)	(1,361)
Corporate / Inter-segment Eliminations | International & Other
Segment Reporting Information [Line Items]
Revenues, net	(2,725)	(985)
Advertising
Segment Reporting Information [Line Items]
Revenues, net	220,713	232,590
Advertising | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	199,142	213,226
Advertising | Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	21,571	19,364
Advertising | Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	0	0
Distribution and other
Segment Reporting Information [Line Items]
Revenues, net	471,028	501,785
Distribution and other | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	374,827	398,667
Distribution and other | Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	99,596	105,464
Distribution and other | Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	$ (3,395)	$ (2,346)