Segment Information (Summary Of Continuing Operations By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Advertising	$ 230,839	$ 153,984	$ 717,571	$ 550,214
Distribution	401,326	365,566	1,184,414	1,015,983
Consolidated revenues, net	632,165	519,550	1,901,985	1,566,197
Adjusted operating cash flow (deficit)	190,582	141,873	641,129	465,898
Depreciation and amortization	(20,862)	(18,295)	(62,429)	(50,220)
Share-based compensation expense	(7,821)	(7,730)	(23,910)	(21,569)
Restructuring Charges	(2,631)	(5,619)	(5,941)	(6,772)
Operating income	159,268	110,229	548,849	387,337
Capital Expenditures			48,810	24,340
National Networks [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	(100)	(2,462)	(817)	(2,462)
International And Other [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	(2,531)	(3,157)	(5,124)	(4,310)
Operating Segments [Member] | National Networks [Member]
Segment Reporting Information [Line Items]
Advertising	210,194	137,993	656,345	509,733
Distribution	311,446	259,422	916,751	734,366
Consolidated revenues, net	521,640	397,415	1,573,096	1,244,099
Adjusted operating cash flow (deficit)	186,574	128,582	622,385	443,246
Depreciation and amortization	(7,337)	(5,205)	(21,911)	(15,158)
Share-based compensation expense	(6,039)	(5,661)	(18,492)	(16,450)
Restructuring Charges	(100)	(2,462)	(817)	(2,462)
Operating income	173,098	115,254	581,165	409,176
Capital Expenditures			17,095	7,744
Operating Segments [Member] | International And Other [Member]
Segment Reporting Information [Line Items]
Advertising	20,645	15,991	61,226	40,481
Distribution	93,458	106,721	272,115	283,409
Consolidated revenues, net	114,103	122,712	333,341	323,890
Adjusted operating cash flow (deficit)	6,749	12,875	21,038	21,363
Depreciation and amortization	(13,525)	(13,090)	(40,518)	(35,062)
Share-based compensation expense	(1,782)	(2,069)	(5,418)	(5,119)
Restructuring Charges	(2,531)	(3,157)	(5,124)	(4,310)
Operating income	(11,089)	(5,441)	(30,022)	(23,128)
Capital Expenditures			31,715	16,596
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Advertising	0	0	0	0
Distribution	(3,578)	(577)	(4,452)	(1,792)
Consolidated revenues, net	(3,578)	(577)	(4,452)	(1,792)
Adjusted operating cash flow (deficit)	(2,741)	416	(2,294)	1,289
Depreciation and amortization	0	0	0	0
Share-based compensation expense	0	0	0	0
Restructuring Charges	0	0	0	0
Operating income	(2,741)	416	(2,294)	1,289
Capital Expenditures			0	0
Intersegment Eliminations [Member] | National Networks [Member]
Segment Reporting Information [Line Items]
Consolidated revenues, net	(3,563)	(407)	(4,351)	(1,397)
Intersegment Eliminations [Member] | International And Other [Member]
Segment Reporting Information [Line Items]
Consolidated revenues, net	$ (15)	$ (170)	$ (101)	$ (395)