Segment Information (Summary Of Continuing Operations By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Advertising									$ 662,789	$ 523,064	$ 447,172
Distribution And Other									929,069	829,513	740,569
Revenues, Net	435,247	395,328	379,322	381,961	366,712	332,056	327,570	326,239	1,591,858	1,352,577	1,187,741
Adjusted Operating Cash Flow (Deficit)									524,189	465,417	441,713
Depreciation And Amortization									(54,667)	(85,380)	(99,848)
Allocated Share-based Compensation Expense									(20,299)	(17,202)	(15,589)
Restructuring Charges									0	3	240
Gain (Loss) Related to Litigation Settlement									132,944	0	0
Operating Income	84,972	122,387	247,324	127,484	80,664	86,859	98,276	97,039	582,167	362,838	326,516
Capital Expenditures									24,303	18,557	15,371
Operating Segments [Member] | International and Other [Member]
Segment Reporting Information [Line Items]
Advertising									0	147	177
Distribution And Other									122,429	114,394	125,396
Revenues, Net									122,429	114,541	125,573
Adjusted Operating Cash Flow (Deficit)									(35,466)	(30,040)	(4,976)
Depreciation And Amortization									(16,794)	(14,944)	(14,147)
Allocated Share-based Compensation Expense									(4,086)	(3,626)	(3,007)
Restructuring Charges										3	240
Gain (Loss) Related to Litigation Settlement									132,944
Operating Income									76,598	(48,607)	(21,890)
Capital Expenditures									19,210	13,016	12,554
Operating Segments [Member] | National Networks [Member]
Segment Reporting Information [Line Items]
Advertising									662,789	522,917	447,449
Distribution And Other									822,227	731,269	634,909
Revenues, Net									1,485,016	1,254,186	1,082,358
Adjusted Operating Cash Flow (Deficit)									555,911	492,129	447,555
Depreciation And Amortization									(37,873)	(70,436)	(85,701)
Allocated Share-based Compensation Expense									(16,213)	(13,576)	(12,582)
Restructuring Charges										0	0
Gain (Loss) Related to Litigation Settlement									0
Operating Income									501,825	408,117	349,272
Capital Expenditures									5,093	5,541	2,817
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Advertising									0	0	(454)
Distribution And Other									(15,587)	(16,150)	(19,736)
Revenues, Net									(15,587)	(16,150)	(20,190)
Adjusted Operating Cash Flow (Deficit)									3,744	3,328	(866)
Depreciation And Amortization									0	0	0
Allocated Share-based Compensation Expense									0	0	0
Restructuring Charges										0	0
Gain (Loss) Related to Litigation Settlement									0
Operating Income									3,744	3,328	(866)
Capital Expenditures									0	0	0
Intersegment Eliminations [Member] | International and Other [Member]
Segment Reporting Information [Line Items]
Revenues, Net									(15,403)	(15,581)	(19,736)
Intersegment Eliminations [Member] | National Networks [Member]
Segment Reporting Information [Line Items]
Revenues, Net									$ (184)	$ (569)	$ (454)