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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 305,583 $ 266,726 $ 289,399 $ 255,970
Net income 17,154 24,551 41,317 65,620
Class A conversion 0   0 0
Acquisition of treasury stock (3,194) (4,997) (3,194) (29,998)
Restricted stock issuances     (4,082) (1,682)
Amortization of restricted stock 1,760 1,836 6,199 6,032
Directors' Compensation Plan     1,077 911
Other comprehensive income   41   122
Ending balance 316,416 283,609 316,416 283,609
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (4,527) $ (4,214) $ (13,249) $ (12,403)
Cash dividends per share (in dollars per share) $ 0.30 $ 0.28 $ 0.88 $ 0.81
Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (360) $ (334) $ (1,051) $ (963)
Cash dividends per share (in dollars per share) $ 0.28 $ 0.26 $ 0.82 $ 0.75
Common Stock | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 30,218 $ 30,006 $ 30,006 $ 29,907
Class A conversion 2   2 3
Restricted stock issuances     212 96
Ending balance 30,220 30,006 30,220 30,006
Common Stock | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,806 1,806 1,806 1,809
Class A conversion (2)   (2) (3)
Ending balance 1,804 1,806 1,804 1,806
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 109,731 105,674 108,706 102,572
Restricted stock issuances     (4,294) (1,778)
Amortization of restricted stock 1,760 1,836 6,199 6,032
Directors' Compensation Plan     880 684
Ending balance 111,491 107,510 111,491 107,510
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 413,143 375,234 398,393 342,983
Net income 17,154 24,551 41,317 65,620
Ending balance 425,410 395,237 425,410 395,237
Retained Earnings | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (4,527) (4,214) (13,249) (12,403)
Retained Earnings | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (360) (334) (1,051) (963)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (756) (2,212) (756) (2,293)
Other comprehensive income   41   122
Ending balance (756) (2,171) (756) (2,171)
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (248,559) (243,782) (248,756) (219,008)
Acquisition of treasury stock (3,194) (4,997) (3,194) (29,998)
Directors' Compensation Plan     197 227
Ending balance $ (251,753) $ (248,779) $ (251,753) $ (248,779)