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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 Income (Loss) [Member]
Total
Class A Common Stock [Member]
Impact of adoption of new accounting pronouncement         $ 0      
Beginning balance at Dec. 31, 2015 $ 28,486 $ 2,554 $ (90,302) $ 83,179 279,760 $ (1,938)    
Balance (in shares) at Dec. 31, 2015 28,486 2,554 (8,884)          
Conversion of Class A Common Stock $ 214 $ (214)            
Conversion of Class A Common Stock (in shares) 214 214            
Stock compensation transactions, net $ 93              
Stock compensation transactions, net (in shares) 93              
Stock option and restricted stock issuances       (975)        
Tax (cost) benefit related to stock-based plans       (121)        
Directors' Compensation Plan     $ 172 318        
Directors' Compensation Plan (in shares)     16          
Purchases     $ (21,282)          
Purchases (in shares)     (1,160)          
Amortization of restricted stock       3,872        
Net income         28,356   $ 28,356  
Cash dividends         (30,409)     $ (2,735)
Pension liabilities adjustment, net of taxes           108    
Ending balance at Dec. 31, 2016 $ 28,793 $ 2,340 $ (111,412) 86,273 277,707 (1,830) 281,871  
Balance (in shares) at Dec. 31, 2016 28,793 2,340 (10,028)          
Impact of adoption of new accounting pronouncement         0      
Conversion of Class A Common Stock $ 50 $ (50)            
Conversion of Class A Common Stock (in shares) 50 50            
Stock compensation transactions, net $ 107              
Stock compensation transactions, net (in shares) 107              
Stock option and restricted stock issuances       (1,662)        
Tax (cost) benefit related to stock-based plans       0        
Directors' Compensation Plan     $ 90 549        
Directors' Compensation Plan (in shares)     8          
Purchases     $ 0          
Purchases (in shares)     0          
Amortization of restricted stock       3,818        
Net income         21,075   21,075  
Cash dividends         (11,392)     (919)
Pension liabilities adjustment, net of taxes           (314)    
Ending balance at Dec. 31, 2017 $ 28,950 $ 2,290 $ (111,322) 88,978 287,390 (2,144) 294,142  
Balance (in shares) at Dec. 31, 2017 28,950 2,290 (10,020)          
Impact of adoption of new accounting pronouncement         133      
Conversion of Class A Common Stock $ 10 $ (10)            
Conversion of Class A Common Stock (in shares) 10 10            
Stock compensation transactions, net $ 119              
Stock compensation transactions, net (in shares) 119              
Stock option and restricted stock issuances       (1,352)        
Tax (cost) benefit related to stock-based plans       0        
Directors' Compensation Plan     $ 1,029 (590)        
Directors' Compensation Plan (in shares)     88          
Purchases     $ (18,732)          
Purchases (in shares)     (890)          
Amortization of restricted stock       4,358        
Net income         30,307   30,307  
Cash dividends         (35,464)     $ (2,869)
Pension liabilities adjustment, net of taxes           679    
Ending balance at Dec. 31, 2018 $ 29,079 $ 2,280 $ (129,025) $ 91,394 $ 282,366 $ (1,465) $ 274,629  
Balance (in shares) at Dec. 31, 2018 29,079 2,280 (10,822)