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Business Segment Information - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) market station | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) market station | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 116,861 | $ 185,851 | $ 390,052 | $ 497,889
Accounting Standards Update 2017-06 | Effect of Accounting Change | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 1,700 | 1,800 | $ 4,900 | 5,800
Media |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of television stations | station | 46 |  | 46 |
Number of markets In which entity operates | market | 38 |  | 38 |
Media | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 130,338 | $ 219,766 | $ 433,629 | $ 568,163

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