Related Party Transactions (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) ft² Director shares	Dec. 31, 2015 USD ($) shares
Related Party Transaction [Line Items]
Number of board of directors \| Director	2
Rental expense for operating leases	$ 1,277	$ 1,261
Payment of dividends on Series D Preferred Stock	399	399
Series D Preferred Stock [Member]
Related Party Transaction [Line Items]
Payment of dividends on Series D Preferred Stock	$ 399	399
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Office and covered garage space leased \| ft²	49,586
Rental expense for operating leases	$ 882	875
Services purchased from related party	215
Members of Management [Member]
Related Party Transaction [Line Items]
Aggregate carrying value of investments in Gray	10,305	$ 14,043
Premiums paid by Gray for group accident plan	$ 478
Members of Management [Member] \| Class A common stock [Member]
Related Party Transaction [Line Items]
Shares of Gray common stock owned (in shares) \| shares	880,272	880,272
Members of Management [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Shares of Gray common stock owned (in shares) \| shares	106,000	106,000

Sum of the carrying amounts as of the balance sheet date of all investments in related party.

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Number of board of directors.

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Amount of premiums paid by a related party for the group accident plan.

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- Definition

Area of a real estate property.

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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column B)
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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
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- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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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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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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