Related Party Transactions (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) ft² Director shares	Dec. 31, 2017 USD ($) shares
Related Party Transaction [Abstract]
Number of board of directors \| Director	2
Rental expense for operating leases	$ 1,233	$ 1,306
Payment of dividends on Series D Preferred Stock	399	399
Series D Preferred Stock [Member]
Related Party Transaction [Abstract]
Payment of dividends on Series D Preferred Stock	$ 399	399
Affiliated Entity [Member]
Related Party Transaction [Abstract]
Office and covered garage space leased \| ft²	49,586
Rental expense for operating leases	$ 781	866
Services purchased from related party	42	54
Members of Management [Member]
Related Party Transaction [Abstract]
Aggregate carrying value of investments in Gray	13,226	14,407
Premiums paid by Gray for group accident plan	$ 403	$ 597
Members of Management [Member] \| Class A common stock [Member]
Related Party Transaction [Abstract]
Shares of Gray common stock owned (in shares) \| shares	880,272	880,272
Members of Management [Member] \| Common Stock [Member]
Related Party Transaction [Abstract]
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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- Definition

Number of board of directors.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-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.

+ References

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- Definition

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

+ References

No definition available.

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