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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 307,098 $ 305,583 $ 308,366 $ 289,399
Net income 4,928 17,154 11,759 41,317
Class A conversion   0 0 0
Acquisition of treasury stock   (3,194)   (3,194)
Restricted stock issuances     (3,295) (4,082)
Amortization of restricted stock 999 1,760 5,128 6,199
Directors' Compensation Plan     1,137 1,077
Ending balance 307,800 316,416 307,800 316,416
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (4,842) $ (4,527) $ (14,173) $ (13,249)
Cash dividends per share (in dollars per share) $ 0.32 $ 0.30 $ 0.94 $ 0.88
Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (383) $ (360) $ (1,122) $ (1,051)
Cash dividends per share (in dollars per share) $ 0.30 $ 0.28 $ 0.88 $ 0.82
Common Stock | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 30,414 $ 30,218 $ 30,220 $ 30,006
Class A conversion   2 6 2
Restricted stock issuances     188 212
Ending balance 30,414 30,220 30,414 30,220
Common Stock | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,798 1,806 1,804 1,806
Class A conversion   (2) (6) (2)
Ending balance 1,798 1,804 1,798 1,804
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 114,644 109,731 113,307 108,706
Restricted stock issuances     (3,483) (4,294)
Amortization of restricted stock 999 1,760 5,128 6,199
Directors' Compensation Plan     691 880
Ending balance 115,643 111,491 115,643 111,491
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 416,233 413,143 419,472 398,393
Net income 4,928 17,154 11,759 41,317
Ending balance 415,936 425,410 415,936 425,410
Retained Earnings | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (4,842) (4,527) (14,173) (13,249)
Retained Earnings | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (383) (360) (1,122) (1,051)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (983) (756) (983) (756)
Ending balance (983) (756) (983) (756)
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (255,008) (248,559) (255,454) (248,756)
Acquisition of treasury stock   (3,194)   (3,194)
Directors' Compensation Plan     446 197
Ending balance $ (255,008) $ (251,753) $ (255,008) $ (251,753)