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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 252,447	$ 281,926	$ 260,503	$ 274,629
Net income	13,640	6,046	15,459	9,668
Dividends declared	(2,593)	(3,338)	(6,052)	(6,725)
Acquisition of treasury stock		(17,843)	(6,810)	(17,843)
Restricted stock issuances	(554)	(795)	(873)	(1,328)
Class A conversion		0		0
Amortization of restricted stock	1,064	890	2,037	1,951
Director's compensation plan	560	627	560	627
Other comprehensive income	29	8	60	17
Ending balance	264,378	267,260	264,378	267,260
Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	$ (215)	(261)	$ (506)	(560)
Class A conversion		$ (222)		$ (222)
Cash dividends, common stock (in dollars per share)	$ 0.14	$ 0.17	$ 0.33	$ 0.34
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 29,458	$ 29,113	$ 29,431	$ 29,079
Restricted stock issuances	80	83	107	117
Class A conversion		222		222
Ending balance	$ 29,538	$ 29,418	$ 29,538	$ 29,418
Cash dividends, common stock (in dollars per share)	$ 0.15	$ 0.18	$ 0.35	$ 0.36
Common Stock [Member] | Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,054	$ 2,280	$ 2,054	$ 2,280
Ending balance	2,054	2,058	2,054	2,058
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	93,835	91,888	93,208	91,394
Restricted stock issuances	(634)	(878)	(980)	(1,445)
Amortization of restricted stock	1,064	890	2,037	1,951
Director's compensation plan	316	(53)	316	(53)
Ending balance	94,581	91,847	94,581	91,847
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	294,068	289,126	295,999	282,366
Net income	13,640	6,046	15,459	9,668
Dividends declared	(2,593)	(3,338)	(6,052)	(6,725)
Ending balance	304,900	291,573	304,900	291,573
Retained Earnings [Member] | Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(215)	(261)	(506)	(560)
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,056)	(1,456)	(2,087)	(1,465)
Other comprehensive income	29	8	60	17
Ending balance	(2,027)	(1,448)	(2,027)	(1,448)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(164,912)	(129,025)	(158,102)	(129,025)
Acquisition of treasury stock		(17,843)	(6,810)	(17,843)
Director's compensation plan	244	680	244	680
Ending balance	$ (164,668)	$ (146,188)	$ (164,668)	(146,188)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				6,824
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				$ 6,824

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