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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 260,400 $ 270,314 $ 255,970 $ 252,967
Net income 21,708 22,858 41,070 42,264
Class A conversion 0 0 0 0
Acquisition of treasury stock (12,500) 0 (25,001)  
Restricted stock issuances (1,165) (2,094) (1,682) (2,894)
Amortization of restricted stock 1,889 1,977 4,196 4,656
Directors' Compensation Plan 911 870 911 870
Other comprehensive income 41 49 81 98
Ending balance 266,726 289,412 266,726 289,412
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (4,225) (4,261) $ (8,189) (7,978)
Dividends declared (in dollars per share) $ 0.28   $ 0.53  
Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (333) (301) $ (630) (571)
Dividends declared (in dollars per share) $ 0.26   $ 0.49  
Common Stock | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 29,924 29,789 $ 29,907 29,600
Class A conversion 3 29 3 183
Restricted stock issuances 79 85 96 120
Ending balance 30,006 29,903 30,006 29,903
Common Stock | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,809 1,842 1,809 1,996
Class A conversion (3) (29) (3) (183)
Ending balance 1,806 1,813 1,806 1,813
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 104,345 98,694 102,572 96,850
Restricted stock issuances (1,244) (2,179) (1,778) (3,014)
Amortization of restricted stock 1,889 1,977 4,196 4,656
Directors' Compensation Plan 684 524 684 524
Ending balance 105,674 99,016 105,674 99,016
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 358,084 320,045 342,983 304,626
Net income 21,708 22,858 41,070 42,264
Ending balance 375,234 338,341 375,234 338,341
Retained Earnings | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (4,225) (4,261) (8,189) (7,978)
Retained Earnings | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (333) (301) (630) (571)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2,253) (2,511) (2,293) (2,560)
Other comprehensive income 41 49 81 98
Ending balance (2,212) (2,462) (2,212) (2,462)
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (231,509) (177,545) (219,008) (177,545)
Acquisition of treasury stock (12,500) (25,001)  
Directors' Compensation Plan 227 346 227 346
Ending balance $ (243,782) $ (177,199) $ (243,782) $ (177,199)