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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 270,314 $ 252,447 $ 252,967 $ 260,503
Net income 22,858 13,640 42,264 15,459
Class A conversion 0   0  
Restricted stock issuances (2,094) (554) (2,894) (873)
Acquisition of treasury stock       (6,810)
Amortization of restricted stock 1,977 1,064 4,656 2,037
Director's compensation plan 870 560 870 560
Other comprehensive income 49 29 98 60
Ending balance 289,412 264,378 289,412 264,378
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared $ (4,261) $ (2,593) $ (7,978) $ (6,052)
Dividends declared (in dollars per share) $ 0.25 $ 0.15 $ 0.47 $ 0.35
Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared $ (301) $ (215) $ (571) $ (506)
Dividends declared (in dollars per share) $ 0.23 $ 0.14 $ 0.43 $ 0.33
Common Stock [Member] | Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 29,789 $ 29,458 $ 29,600 $ 29,431
Class A conversion 29   183  
Restricted stock issuances 85 80 120 107
Ending balance 29,903 29,538 29,903 29,538
Common Stock [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,842 2,054 1,996 2,054
Class A conversion (29)   (183)  
Ending balance 1,813 2,054 1,813 2,054
Additional Paid-In Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 98,694 93,835 96,850 93,208
Restricted stock issuances (2,179) (634) (3,014) (980)
Amortization of restricted stock 1,977 1,064 4,656 2,037
Director's compensation plan 524 316 524 316
Ending balance 99,016 94,581 99,016 94,581
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 320,045 294,068 304,626 295,999
Net income 22,858 13,640 42,264 15,459
Ending balance 338,341 304,900 338,341 304,900
Retained Earnings [Member] | Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared (4,261) (2,593) (7,978) (6,052)
Retained Earnings [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared (301) (215) (571) (506)
Accumulated Other Comprehensive Loss [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2,511) (2,056) (2,560) (2,087)
Other comprehensive income 49 29 98 60
Ending balance (2,462) (2,027) (2,462) (2,027)
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (177,545) (164,912) (177,545) (158,102)
Acquisition of treasury stock       (6,810)
Director's compensation plan 346 244 346 244
Ending balance $ (177,199) $ (164,668) $ (177,199) $ (164,668)