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Segment Information (Summary Of Inter-Segment Eliminations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues, net | $ 740,823 | $ 720,189
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues, net | (3,595) | (1,755)
Intersegment Eliminations [Member] | National Networks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues, net | (2,535) | (1,724)
Intersegment Eliminations [Member] | International And Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues, net | $ (1,060) | $ (31)

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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- Details
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