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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 252,967	$ 260,503
Net income	19,406	1,819
Dividends declared	(3,717)	(3,459)
Class A conversion	0
Restricted stock issuances	(800)	(318)
Acquisition of treasury stock		(6,810)
Amortization of restricted stock	2,679	972
Other comprehensive income	49	31
Ending balance	270,314	252,447
Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(270)	$ (291)
Class A conversion	$ (154)
Cash dividends, common stock (in dollars per share)	$ 0.20	$ 0.19
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 29,600	$ 29,431
Class A conversion	154
Restricted stock issuances	35	27
Ending balance	$ 29,789	$ 29,458
Cash dividends, common stock (in dollars per share)	$ 0.22	$ 0.20
Common Stock [Member] | Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,996	$ 2,054
Ending balance	1,842	2,054
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	96,850	93,208
Restricted stock issuances	(835)	(345)
Amortization of restricted stock	2,679	972
Ending balance	98,694	93,835
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	304,626	295,999
Net income	19,406	1,819
Dividends declared	(3,717)	(3,459)
Ending balance	320,045	294,068
Retained Earnings [Member] | Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(270)	(291)
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,560)	(2,087)
Other comprehensive income	49	31
Ending balance	(2,511)	(2,056)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(177,545)	(158,102)
Acquisition of treasury stock		(6,810)
Ending balance	$ (177,545)	$ (164,912)

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