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Segment Information (Summary Of Continuing Operations By Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Advertising | $ 248,240 | $ 267,612
Distribution | 492,583 | 452,577
Consolidated revenues, net | 740,823 | 720,189
Operating income | 233,655 | 231,671
Share-based compensation expense | 15,319 | 12,464
Restructuring expense | 0 | 2,704
Depreciation and amortization | 20,354 | 23,493
Adjusted operating income (loss) | 269,328 | 270,332
Capital expenditures | 11,942 | 20,206
Operating Segments [Member] | National Networks [Member] |  |
Segment Reporting Information [Line Items] |  |
Advertising | 225,730 | 247,542
Distribution | 407,298 | 367,605
Consolidated revenues, net | 633,028 | 615,147
Operating income | 249,852 | 249,607
Share-based compensation expense | 12,527 | 9,908
Restructuring expense |  | 54
Depreciation and amortization | 8,495 | 8,404
Adjusted operating income (loss) | 270,874 | 267,973
Capital expenditures | 2,148 | 5,135
Operating Segments [Member] | International And Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Advertising | 22,510 | 20,070
Distribution | 88,880 | 86,727
Consolidated revenues, net | 111,390 | 106,797
Operating income | (16,814) | (19,217)
Share-based compensation expense | 2,792 | 2,556
Restructuring expense |  | 2,650
Depreciation and amortization | 11,859 | 15,089
Adjusted operating income (loss) | (2,163) | 1,078
Capital expenditures | 9,794 | 15,071
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Advertising | 0 | 0
Distribution | (3,595) | (1,755)
Consolidated revenues, net | (3,595) | (1,755)
Operating income | 617 | 1,281
Share-based compensation expense | 0 | 0
Restructuring expense |  | 0
Depreciation and amortization | 0 | 0
Adjusted operating income (loss) | 617 | 1,281
Capital expenditures | 0 | 0
Intersegment Eliminations [Member] | National Networks [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated revenues, net | (2,535) | (1,724)
Intersegment Eliminations [Member] | International And Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated revenues, net | $ (1,060) | $ (31)

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