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Segment Information (Summary Of Continuing Operations By Reportable Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Advertising                 $ 1,049,445 $ 1,083,975 $ 1,028,260
Distribution                 1,756,246 1,671,679 1,552,675
Consolidated revenues, net $ 726,934 $ 648,023 $ 710,545 $ 720,189 $ 729,597 $ 634,646 $ 684,832 $ 706,579 2,805,691 2,755,654 2,580,935
Operating income $ 161,544 $ 153,354 175,790 $ 231,671 $ 103,728 $ 117,137 $ 178,032 $ 258,659 722,359 657,556 709,193
Share-based compensation expense                 53,545 38,897 31,020
Restructuring expense                 6,128 29,503 14,998
Impairment and related charges     $ 11,000           28,148 67,805 0
Depreciation and amortization                 (94,638) (84,778) (83,031)
Segment Reporting Information, Adjusted Operating Income                 904,818 878,539 838,242
Payments to Acquire Property, Plant, and Equipment                 80,049 79,220 68,321
National Networks [Member]                      
Segment Reporting Information [Line Items]                      
Restructuring expense                 (53) 8,516 3,194
International And Other [Member]                      
Segment Reporting Information [Line Items]                      
Restructuring expense                 6,181 20,987 11,804
Operating Segments [Member] | National Networks [Member]                      
Segment Reporting Information [Line Items]                      
Advertising                 959,551 990,508 945,288
Distribution                 1,408,064 1,320,532 1,190,079
Consolidated revenues, net                 2,367,615 2,311,040 2,135,367
Operating income                 817,566 784,027 754,243
Share-based compensation expense                 43,697 30,569 23,814
Restructuring expense                 (53) 8,516 3,194
Impairment and related charges                 0 0  
Depreciation and amortization                 (33,702) (32,376) (29,742)
Segment Reporting Information, Adjusted Operating Income                 894,912 855,488 810,993
Payments to Acquire Property, Plant, and Equipment                 25,333 15,947 24,386
Operating Segments [Member] | International And Other [Member]                      
Segment Reporting Information [Line Items]                      
Advertising                 89,894 94,467 82,972
Distribution                 367,288 365,529 369,606
Consolidated revenues, net                 457,182 459,996 452,578
Operating income                 (88,894) (120,914) (42,542)
Share-based compensation expense                 9,848 8,328 7,206
Restructuring expense                 6,181 20,987 11,804
Impairment and related charges                 28,148 67,805  
Depreciation and amortization                 (60,936) (52,402) (53,289)
Segment Reporting Information, Adjusted Operating Income                 16,219 28,608 29,757
Payments to Acquire Property, Plant, and Equipment                 54,716 63,273 43,935
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Advertising                 0 (1,000) 0
Distribution                 (19,106) (14,382) (7,010)
Consolidated revenues, net                 (19,106) (15,382) (7,010)
Operating income                 (6,313) (5,557) (2,508)
Share-based compensation expense                 0 0 0
Restructuring expense                 0 0 0
Impairment and related charges                 0 0  
Depreciation and amortization                 0 0 0
Segment Reporting Information, Adjusted Operating Income                 (6,313) (5,557) (2,508)
Payments to Acquire Property, Plant, and Equipment                 0 0 0
Intersegment Eliminations [Member] | National Networks [Member]                      
Segment Reporting Information [Line Items]                      
Consolidated revenues, net                 (17,634) (14,963) (6,719)
Intersegment Eliminations [Member] | International And Other [Member]                      
Segment Reporting Information [Line Items]                      
Consolidated revenues, net                 $ (1,472) $ (419) $ (291)