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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
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
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2017 $ 28,950 $ 2,290 $ (111,322) $ 88,978 $ 287,390 $ (2,144)   $ 133
Balance (in shares) at Dec. 31, 2017 28,950 2,290 (10,020)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Conversion of Class A Common Stock $ 10              
Conversion of Class A Common Stock (in shares) 10              
Stock compensation transactions, net $ 119              
Stock compensation transactions, net (in shares) 119              
Conversion to Common Stock   $ (10)            
Conversion to Common Stock (in shares)   (10)            
Stock option and restricted stock issuances       (1,352)        
Director's compensation plan     $ 1,029 (590)        
Directors' compensation plan (in shares)     88          
Purchases     $ (18,732)          
Purchases (in shares)     (890)          
Stock-based compensation       4,358        
Net income         30,307   $ 30,307  
Cash dividends $ (32,595) $ (2,869)     (35,464)      
Pension liabilities adjustment, net of taxes           679 (679)  
Ending balance at Dec. 31, 2018 $ 29,079 $ 2,280 $ (129,025) 91,394 282,366 (1,465) 274,629 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 $ (13,913) $ (1,143)     (15,056)      
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 $ (46,564) $ (3,957)     (50,521)      
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  
Balance (in shares) at Dec. 31, 2020 29,600 1,996 (13,384)