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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)

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