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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Common Stock [Member]
Common Stock [Member]
Class A Common Stock [Member]
Treasury Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Common Stock [Member]
Class A Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2018 $ 29,079 $ 2,280 $ (129,025) $ 91,394 $ 282,366 $ (1,465)       $ 6,824
Balance (in shares) at Dec. 31, 2018 29,079 2,280 (10,822)              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Conversion of Class A Common Stock $ 226                  
Conversion of Class A Common Stock (in shares) 226                  
Stock compensation transactions, net $ 126                  
Stock compensation transactions, net (in shares) 126                  
Conversion to Common Stock   $ (226)                
Conversion to Common Stock (in shares)   (226)                
Stock option and restricted stock issuances       (1,568)            
Director's compensation plan     $ 680 (53)            
Directors' compensation plan (in shares)     55              
Purchases     $ (29,757)              
Purchases (in shares)     (1,605)              
Stock-based compensation       3,435            
Net income         21,865   $ 21,865      
Cash dividends         (15,056)     $ (13,913) $ (1,143)  
Pension liabilities adjustment, net of taxes           (622) 622      
Ending balance at Dec. 31, 2019 $ 29,431 $ 2,054 $ (158,102) 93,208 295,999 (2,087) 260,503     0
Balance (in shares) at Dec. 31, 2019 29,431 2,054 (12,372)              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Conversion of Class A Common Stock $ 58                  
Conversion of Class A Common Stock (in shares) 58                  
Stock compensation transactions, net $ 111                  
Stock compensation transactions, net (in shares) 111                  
Conversion to Common Stock   $ (58)                
Conversion to Common Stock (in shares)   (58)                
Stock option and restricted stock issuances       (1,063)            
Director's compensation plan     $ 265 330            
Directors' compensation plan (in shares)     21              
Purchases     $ (19,708)              
Purchases (in shares)     (1,033)              
Stock-based compensation       4,375            
Net income         59,148   59,148      
Cash dividends         (50,521)     (46,564) (3,957)  
Pension liabilities adjustment, net of taxes           (473) 473      
Ending balance at Dec. 31, 2020 $ 29,600 $ 1,996 $ (177,545) 96,850 304,626 (2,560) 252,967     $ 0
Balance (in shares) at Dec. 31, 2020 29,600 1,996 (13,384)              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Conversion of Class A Common Stock $ 187                  
Conversion of Class A Common Stock (in shares) 187                  
Stock compensation transactions, net $ 120                  
Stock compensation transactions, net (in shares) 120                  
Conversion to Common Stock   $ (187)                
Conversion to Common Stock (in shares)   (187)                
Stock option and restricted stock issuances       (3,014)            
Director's compensation plan     $ 346 523            
Directors' compensation plan (in shares)     25              
Purchases     $ (41,809)              
Purchases (in shares)     (1,232)              
Stock-based compensation       8,213            
Net income         90,803   90,803      
Cash dividends         (52,446)     $ (48,837) $ (3,609)  
Pension liabilities adjustment, net of taxes           267 (267)      
Ending balance at Dec. 31, 2021 $ 29,907 $ 1,809 $ (219,008) $ 102,572 $ 342,983 $ (2,293) $ 255,970      
Balance (in shares) at Dec. 31, 2021 29,907 1,809 (14,591)