Number of full power television stations to be acquired.

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Amount of consideration to be transferred, consisting of assets to be transferred by the acquirer, liabilities to be incurred by the acquirer and equity interest to be issued by the acquirer upon closing of the proposed acquisition.

+ References

No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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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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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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- Definition

The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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Acquisitions and Dispositions - WVMH - Additional Information (Details) $ in Thousands					3 Months Ended								12 Months Ended
	Jan. 31, 2017 USD ($)	Aug. 02, 2016	Jan. 04, 2016 USD ($)	Nov. 16, 2015 USD ($) TelevisionStation	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Revenue included in consolidated statements of operations and comprehensive income					$ 653,664	$ 611,870	$ 626,115	$ 540,317	$ 309,879	$ 275,659	$ 261,994	$ 255,658	$ 2,431,966	$ 1,103,190	$ 896,377
Operating income (loss)					$ 140,837	$ 129,072	$ 138,685	$ 110,151	$ 92,475	$ 72,897	$ 64,007	$ 57,929	518,745	287,308	$ 206,107
WVMH [Member]
Business Acquisition [Line Items]
Purchase price of entities to be acquired				$ 130,000
Cash paid in business acquisition	$ 66,900		$ 64,964
Deposits and payments for acquisitions				$ 6,500
Revenue included in consolidated statements of operations and comprehensive income													51,300
Operating income (loss)													11,500
Acquisition related costs													$ 0	$ 0
WVMH [Member] \| Consolidated VIEs [Member]
Business Acquisition [Line Items]
Network affiliation agreements useful life		15 years
WVMH [Member] \| Other definite-lived intangible assets [Member]
Business Acquisition [Line Items]
Weighted average estimated useful life of other intangible assets			3 years
WVMH [Member] \| CBS Affiliation [Member]
Business Acquisition [Line Items]
Number of television stations to be acquired \| TelevisionStation				3
WVMH [Member] \| NBC Affiliation [Member]
Business Acquisition [Line Items]
Number of television stations to be acquired \| TelevisionStation				1