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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 255,970 $ 252,967
Net income 19,361 19,406
Class A conversion   0
Acquisition of treasury stock (12,501)  
Restricted stock issuances (517) (800)
Amortization of restricted stock 2,307 2,679
Other comprehensive income 40 49
Ending balance 260,400 270,314
Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared $ (3,964) $ (3,717)
Dividends declared (in dollars per share) $ 0.25 $ 0.22
Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared $ (296) $ (270)
Dividends declared (in dollars per share) $ 0.23 $ 0.20
Common Stock [Member] | Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 29,907 $ 29,600
Class A conversion   154
Restricted stock issuances 17 35
Ending balance 29,924 29,789
Common Stock [Member] | Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 1,809 1,996
Class A conversion   (154)
Ending balance 1,809 1,842
Additional Paid-In Capital [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 102,572 96,850
Restricted stock issuances (534) (835)
Amortization of restricted stock 2,307 2,679
Ending balance 104,345 98,694
Retained Earnings [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 342,983 304,626
Net income 19,361 19,406
Ending balance 358,084 320,045
Retained Earnings [Member] | Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared (3,964) (3,717)
Retained Earnings [Member] | Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared (296) (270)
Accumulated Other Comprehensive Loss [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (2,293) (2,560)
Other comprehensive income 40 49
Ending balance (2,253) (2,511)
Treasury Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (219,008) (177,545)
Acquisition of treasury stock (12,501)  
Ending balance $ (231,509) $ (177,545)