Segment Information (Summary of Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues, net	$ 771,392	$ 646,291	$ 1,463,133	$ 1,380,666
Operating income (loss)	68,256	48,802	237,964	221,772
Share-based compensation expense	16,262	15,235	29,708	30,747
Depreciation and amortization	22,604	25,905	47,850	52,635
Impairment and other charges	142,918	130,411	158,973	130,411
Restructuring and other related charges	155	3,507	8,780	9,473
Cloud computing amortization	642		906
Majority-owned equity investees AOI	(200)	1,418	4,435	2,694
Adjusted operating income	250,637	225,278	488,616	447,732
Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	639,015	562,932
Operating income (loss)	88,116	217,586
Share-based compensation expense	7,292	4,844
Depreciation and amortization	11,716	11,301
Impairment and other charges	143,000	0
Restructuring and other related charges	216	1,204	2,643	2,686
Cloud computing amortization	0
Majority-owned equity investees AOI	(200)	1,418
Adjusted operating income	250,140	236,353
Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net			1,212,984	1,174,825
Operating income (loss)			304,575	442,187
Share-based compensation expense			12,931	7,568
Depreciation and amortization			25,089	22,251
Impairment and other charges			143,000	0
Restructuring and other related charges			2,643	2,686
Cloud computing amortization			0
Majority-owned equity investees AOI			4,435	2,694
Adjusted operating income			492,673	477,386
Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	138,277	90,682	259,444	215,510
Operating income (loss)	19,963	(125,562)	16,801	(121,201)
Share-based compensation expense	913	909	2,144	1,518
Depreciation and amortization	4,328	7,563	9,277	16,459
Impairment and other charges	(82)	130,411	15,973	130,411
Restructuring and other related charges	(17)	2,262	4,473	6,239
Cloud computing amortization	0		0
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	25,105	15,583	48,668	33,426
Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	(5,900)	(7,323)	(9,295)	(9,669)
Operating income (loss)	(39,823)	(43,222)	(83,412)	(99,214)
Share-based compensation expense	8,057	9,482	14,633	21,661
Depreciation and amortization	6,560	7,041	13,484	13,925
Impairment and other charges	0	0	0	0
Restructuring and other related charges	(44)	41	1,664	548
Cloud computing amortization	642		906
Majority-owned equity investees AOI	0	0	0	0
Adjusted operating income	(24,608)	(26,658)	(52,725)	(63,080)
Corporate / Inter-segment Eliminations | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	(6,256)	(6,196)	(6,926)	(7,557)
Corporate / Inter-segment Eliminations | International & Other
Segment Reporting Information [Line Items]
Revenues, net	356	(1,127)	(2,369)	(2,112)
Advertising
Segment Reporting Information [Line Items]
Revenues, net	238,249	202,244	458,962	434,834
Advertising | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	212,282	187,434
Advertising | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net			411,424	400,660
Advertising | Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	25,967	14,810	47,538	34,174
Advertising | Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	0	0	0	0
Distribution and other
Segment Reporting Information [Line Items]
Revenues, net	533,143	444,047	1,004,171	945,832
Distribution and other | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	426,733	375,498
Distribution and other | Operating segments | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net			801,560	774,165
Distribution and other | Operating segments | International & Other
Segment Reporting Information [Line Items]
Revenues, net	112,310	75,872	211,906	181,336
Distribution and other | Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	$ (5,900)	$ (7,323)	$ (9,295)	$ (9,669)