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Acquisitions and Dispositions (Details Textual) - USD ($) |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 02, 2017 | May 09, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1] | Jan. 16, 2017 | Dec. 02, 2016 | Nov. 14, 2016 | Nov. 08, 2016 | Oct. 11, 2016 | Sep. 12, 2016 | Aug. 11, 2016 | Jun. 03, 2016 | Apr. 11, 2016 | Apr. 08, 2016 | Mar. 25, 2016 | Mar. 16, 2016 | Nov. 02, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  |  | $ 26,269,000 |  | $ 14,243,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 1,300,000 | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 24,200,000 | 24,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joplin, Missouri and Victoria, Texas Television Stations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  | 69,500,000 | 69,528,000 | [1] | 0 | [1] | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | 66,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  | $ 0 |  | $ 3,868,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Apex Real Property Llc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FM Translator [Member] | Portland, Maine market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |
FM Translator [Member] | Milwaukee, Wisconsin Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
FM Station [Member] | Wilks Broadcast - Columbus, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,791,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 734,000
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,000
Tennessee Market [Member] | FM Translator Serving the Charlottesville [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |
Iowa Market [Member] | FM Translator Serving the Spencer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |
Iowa Market [Member] | FM Translator Serving Des Moines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
Virginia Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  |  |  |  |  |  |  | $ 1,658,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Market [Member] | FM Translator Serving the Charlottesville [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Washington Market [Member] | FM Translator Serving the Bellingham [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  | $ 50,000 |  |  |  |  |  |
Maine market [Member] | FM Translator Serving the Portland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000 |  |  |  |  |  |  |
Illinois Market [Member] | FM Translator Serving Springfield [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  | $ 23,000 |  |  |  |  |  |  |  |  |  |
New York Market [Member] | FM Translator Serving Ithaca [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |
[1] | Net proceeds from the sale of the television stations reflect the sales price of $66.6 million, the sale of accounts receivable of approximately $3.4 million, offset by certain closing adjustments and transactional costs of approximately $500 thousand.

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