Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member]	Retained Earnings [Member]	Treasury Stock [Member] Common Class A [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017	8,349,069	88,788,664		(1,750,692)	(5,535,076)
Balance at Dec. 31, 2017	$ 25,000	$ 902,000	$ 162,000	$ (24,000)	$ (50,000)	$ (22,000)	$ 993,000
Net (loss) income			20,000				20,000
Restricted stock awards (in shares)	220,080	318,196		(89,422)	(107,456)
Restricted stock awards				$ (1,000)	$ (2,000)		(3,000)
Restricted stock unit awards (in shares)		209,500			(82,201)
Restricted stock unit awards					$ (1,000)		(1,000)
Repurchase of common stock (in shares)					(1,551,710)
Repurchase of common stock					$ (20,000)		(20,000)
Share-based compensation		$ 2,000					2,000
Balance (in shares) at Mar. 31, 2018	8,569,149	89,316,360		(1,840,114)	(7,276,443)
Balance at Mar. 31, 2018	$ 25,000	$ 904,000	182,000	$ (25,000)	$ (73,000)	(22,000)	991,000
Balance (in shares) at Dec. 31, 2018	8,569,149	89,298,943		(1,840,114)	(7,276,443)
Balance at Dec. 31, 2018	$ 27,000	$ 907,000	372,000	$ (26,000)	$ (72,000)	(21,000)	1,187,000
Net (loss) income			(18,000)				(18,000)
Restricted stock awards (in shares)	199,810	677,602		(47,653)	(123,167)
Restricted stock awards					$ (3,000)		(3,000)
Restricted stock unit awards
Share-based compensation		$ 2,000					2,000
Balance (in shares) at Mar. 31, 2019	8,768,959	101,672,999		(1,887,767)	(7,399,610)
Balance at Mar. 31, 2019	$ 27,000	$ 1,083,000	343,000	$ (26,000)	$ (75,000)	(23,000)	1,329,000
Preferred stock dividends			(13,000)				(13,000)
Acquisitions of television businesses and licenses (in shares)		11,499,945
Acquisitions of television businesses and licenses		$ 170,000					170,000
401(k) Plan (in shares)		196,509
401(k) Plan		$ 4,000					4,000
Adoption of ASU 2018-02			$ 2,000			$ (2,000)