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Business Segment Information - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) segment market station	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Operating income	$ 153,376	$ 203,369
Media
Segment Reporting Information [Line Items]
Number of television stations | station	46
Number of markets In which entity operates | market	38
Operating Segments | Media
Segment Reporting Information [Line Items]
Operating income	$ 139,624	170,358
Corporate
Segment Reporting Information [Line Items]
Operating income	(15,023)	(14,208)
Accounting Standards Update 2017-06 | Effect of Accounting Change
Segment Reporting Information [Line Items]
Operating income	$ 1,400	1,450
Accounting Standards Update 2017-06 | Effect of Accounting Change | Operating Segments | Media
Segment Reporting Information [Line Items]
Operating income		1,100
Accounting Standards Update 2017-06 | Effect of Accounting Change | Corporate
Segment Reporting Information [Line Items]
Operating income		$ 400

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Number of Television Stations

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Number of Markets In Which Entity Operates

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The net result for the period of deducting operating expenses from operating revenues.

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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.

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