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Discontinued Operations (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Nov. 03, 2017 | Oct. 05, 2017 | Sep. 02, 2017 | May 09, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | $ 23,000,000 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Tax Rate |  |  |  |  |  | 41.00% |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  |  |  |  |  | $ 50,000 |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  | $ 1,300,000 | 3,400,000 |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 24,200,000 | 24,200,000 |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit | $ 5,000,000 | $ 5,287,000 |  |  |  |  |  |  |  |
Joplin, Missouri and Victoria, Texas Television Stations [Member] |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total |  |  |  | 29,900,000 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | 66,600,000 |  |  |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  |  |  | 500,000 |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  |  | $ 69,500,000 |  | 69,528,000 | [1] | $ 0 | [1] | $ 0
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  |  |  |  | $ 0 |  | $ 3,868,000 |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  | $ 50,800,000 |  |  |  |  |
[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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