Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Restricted Stock [Member] Common Stock [Member] Common Class A [Member]	Restricted Stock [Member] Common Stock [Member]	Restricted Stock [Member] Retained Earnings [Member]	Restricted Stock [Member] Treasury Stock [Member] Common Class A [Member]	Restricted Stock [Member] Treasury Stock [Member]	Restricted Stock [Member] AOCI Attributable to Parent [Member]	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member] Common Class A [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member] Treasury Stock [Member] Common Class A [Member]	Restricted Stock Units (RSUs) [Member] Treasury Stock [Member]	Restricted Stock Units (RSUs) [Member] AOCI Attributable to Parent [Member]	Restricted Stock Units (RSUs) [Member]	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]	Common Class A [Member]	Total
Balance (in shares) at Dec. 31, 2019															8,768,959	101,746,860		(1,887,767)	(9,088,498)
Balance at Dec. 31, 2019															$ 31,000	$ 1,093,000	$ 504,000	$ (26,000)	$ (107,000)	$ (31,000)		$ 1,464,000
Net income															0	0	53,000	0	0	0		53,000
Preferred stock dividends															$ 0	$ 0	(13,000)	$ 0	$ 0	0		(13,000)
401(k) Plan (in shares)															0	430,899		0	0
401(k) Plan															$ 0	$ 4,000	0	$ 0	$ 0	0		4,000
2007 Long Term Incentive Plan - stock options exercised (in shares)															0	274,746		0	(154,935)
2007 Long Term Incentive Plan - stock options exercised															$ 0	$ 0	0	$ 0	$ (2,000)	0		(2,000)
Restricted stock awards (in shares)	166,814	248,543		0	(118,550)
Restricted stock awards	$ 0	$ 0	$ 0	$ 0	$ (2,000)	$ 0	$ (2,000)
Forfeiture of restricted stock awards (in shares)															0	(85,630)		0	0
Forfeiture of restricted stock awards															$ 0	$ 0	0	$ 0	$ 0	0		0
Repurchase of common stock (in shares)															0	0		0	(500,923)
Repurchase of common stock															$ 0	$ 0	0	$ 0	$ (6,000)	0		(6,000)
Share-based compensation															$ 0	$ 4,000	0	$ 0	$ 0	0		4,000
Balance (in shares) at Mar. 31, 2020															8,935,773	102,615,418		(1,887,767)	(9,862,906)
Balance at Mar. 31, 2020															$ 31,000	$ 1,101,000	544,000	$ (26,000)	$ (117,000)	(31,000)		1,502,000
Common stock dividends																					$ 0	(8,000)
Balance (in shares) at Dec. 31, 2020															8,935,773	103,100,856		(1,887,767)	(14,960,597)
Balance at Dec. 31, 2020															$ 34,000	$ 1,110,000	862,000	$ (26,000)	$ (188,000)	(39,000)		1,753,000
Net income															0	0	39,000	0	0	0		39,000
Preferred stock dividends															$ 0	$ 0	(13,000)	$ 0	$ 0	0		(13,000)
401(k) Plan (in shares)															0	390,389		0	0
401(k) Plan															$ 0	$ 7,000	0	$ 0	$ 0	0		7,000
Restricted stock awards (in shares)								0	60,050		0	(18,275)			233,425	296,042		(110,412)	(239,597)
Restricted stock awards								$ 0	$ 0	$ 0	$ 0	$ (1,000)	$ 0	$ (1,000)	$ 0	$ 0	0	$ (2,000)	$ (4,000)	0		(6,000)
Repurchase of common stock																						0
Share-based compensation															$ 1,000	$ 2,000	0	$ 0	$ 0	0		3,000
Balance (in shares) at Mar. 31, 2021															9,169,198	103,847,337		(1,998,179)	(15,218,469)
Balance at Mar. 31, 2021															$ 35,000	$ 1,119,000	880,000	$ (28,000)	$ (193,000)	(39,000)		1,774,000
Common stock dividends															$ 0	$ 0	$ (8,000)	$ 0	$ 0	$ 0		$ (8,000)