Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 296,412	$ 260,400	$ 289,399	$ 255,970
Net income	11,792	21,708	24,164	41,070
Class A conversion		0		0
Acquisition of treasury stock		(12,500)		(25,001)
Restricted stock issuances	(1,294)	(1,165)	(4,082)	(1,682)
Amortization of restricted stock	2,482	1,889	4,439	4,196
Directors' Compensation Plan	1,077	911	1,077	911
Other comprehensive income		41		81
Ending balance	305,583	266,726	305,583	266,726
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock/Class A Common Stock, Dividends declared	$ (4,527)	$ (4,225)	$ (8,721)	$ (8,189)
Cash dividends per share (in dollars per share)	$ 0.30	$ 0.28	$ 0.58	$ 0.53
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock/Class A Common Stock, Dividends declared	$ (359)	$ (333)	$ (693)	$ (630)
Cash dividends per share (in dollars per share)	$ 0.28	$ 0.26	$ 0.54	$ 0.49
Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 30,122	$ 29,924	$ 30,006	$ 29,907
Class A conversion		3		3
Restricted stock issuances	96	79	212	96
Ending balance	30,218	30,006	30,218	30,006
Common Stock | Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,806	1,809	1,806	1,809
Class A conversion		(3)		(3)
Ending balance	1,806	1,806	1,806	1,806
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	107,759	104,345	108,706	102,572
Restricted stock issuances	(1,390)	(1,244)	(4,294)	(1,778)
Amortization of restricted stock	2,482	1,889	4,439	4,196
Directors' Compensation Plan	880	684	880	684
Ending balance	109,731	105,674	109,731	105,674
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	406,237	358,084	398,393	342,983
Net income	11,792	21,708	24,164	41,070
Ending balance	413,143	375,234	413,143	375,234
Retained Earnings | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock/Class A Common Stock, Dividends declared	(4,527)	(4,225)	(8,721)	(8,189)
Retained Earnings | Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock/Class A Common Stock, Dividends declared	(359)	(333)	(693)	(630)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(756)	(2,253)	(756)	(2,293)
Other comprehensive income		41		81
Ending balance	(756)	(2,212)	(756)	(2,212)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(248,756)	(231,509)	(248,756)	(219,008)
Acquisition of treasury stock		(12,500)		(25,001)
Directors' Compensation Plan	197	227	197	227
Ending balance	$ (248,559)	$ (243,782)	$ (248,559)	$ (243,782)