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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset | $ 2,544 | $ 2,546 |
Amortization of Intangible Assets | $ 47,100 | 38,600 | $ 42,000
Percentage Of Hypothetical Decrease | 20.00% |  |
National Networks [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset | $ 2,544 | 2,546 |
International And Other [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset | $ 0 | $ 0 |
Hypothetical Decrease, Fair Value of Reporting Unit | 2.00% |  |
Accelerated Amortization of Intangible Assets | $ 9,000 |  |

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- Definition Percentage of hypothetical decrease in the fair value of the reporting units required for the Company to perform step-two of the quantitative assessment. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of (increase) decrease to an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from the subsequent recognition of deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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