Segment Information (Summary Of Continuing Operations By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Advertising									$ 523,064	$ 447,172	$ 397,678
Distribution And Other									829,513	740,569	680,622
Consolidated Revenues, Net	366,712	332,056	327,570	326,239	338,959	283,914	291,965	272,903	1,352,577	1,187,741	1,078,300
Adjusted Operating Cash Flow (Deficit)									465,417	441,713	401,279
Depreciation And Amortization									(85,380)	(99,848)	(106,455)
Share-based Compensation Expense									17,202	15,589	17,206
Restructuring Credit									3	240	2,218
Operating Income	80,664	86,859	98,276	97,039	79,119	94,444	82,274	70,679	362,838	326,516	279,836
Capital Expenditures									18,557	15,371	17,243
National Networks [Member]
Segment Reporting Information [Line Items]
Advertising									522,917	447,449	397,619
Distribution And Other									731,269	634,909	596,954
Consolidated Revenues, Net									1,254,186	1,082,358	994,573
Adjusted Operating Cash Flow (Deficit)									492,129	447,555	419,051
Depreciation And Amortization									(70,436)	(85,701)	(92,735)
Share-based Compensation Expense									13,576	12,582	13,791
Restructuring Credit									0	0	0
Operating Income									408,117	349,272	312,525
Capital Expenditures									5,541	2,817	1,600
International And Other [Member]
Segment Reporting Information [Line Items]
Advertising									147	177	384
Distribution And Other									114,394	125,396	104,115
Consolidated Revenues, Net									114,541	125,573	104,499
Adjusted Operating Cash Flow (Deficit)									(30,040)	(4,976)	(14,686)
Depreciation And Amortization									(14,944)	(14,147)	(13,720)
Share-based Compensation Expense									3,626	3,007	3,415
Restructuring Credit									3	240	2,218
Operating Income									(48,607)	(21,890)	(29,603)
Capital Expenditures									13,016	12,554	15,643
Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Advertising									0	(454)	(325)
Distribution And Other									(16,150)	(19,736)	(20,447)
Consolidated Revenues, Net									(16,150)	(20,190)	(20,772)
Adjusted Operating Cash Flow (Deficit)									3,328	(866)	(3,086)
Depreciation And Amortization									0	0	0
Share-based Compensation Expense									0	0	0
Restructuring Credit									0	0	0
Operating Income									3,328	(866)	(3,086)
Capital Expenditures									$ 0	$ 0	$ 0