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Segment Information (Summary Of Inter-Segment Eliminations) (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] |  |  |  |  |  |  |  |  |  |  |
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
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | (19,106) | (15,382) | (7,010)
Intersegment Eliminations [Member] | National Networks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | (17,634) | (14,963) | (6,719)
Intersegment Eliminations [Member] | International And Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | $ (1,472) | $ (419) | $ (291)

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