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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]
Balance at Dec. 31, 2014 $ 28,327 $ 2,603 $ (76,436) $ 79,726 $ 260,031 $ (2,168)    
Balance (in shares) at Dec. 31, 2014 28,326,770 2,603,410 (8,281,277)          
Conversion of Class A Common Stock $ 49 $ (49)            
Conversion of Class A Common Stock (in shares) 48,951 (48,951)            
Stock compensation transactions, net $ 110              
Stock compensation transactions, net (in shares) 110,037              
Stock option and restricted stock issuances       (1,312)        
Tax (cost) benefit related to stock-based plans       253        
Directors' Compensation Plan     $ 136 479        
Directors' Compensation Plan (in shares)     14,274          
Purchases     $ (14,002)          
Purchases (in shares)     (617,021)          
Amortization of restricted stock       4,033        
Net income         27,789   $ 27,789  
Cash dividends         (8,060)     $ (702)
Pension liabilities adjustment, net of taxes           230    
Balance at Dec. 31, 2015 $ 28,486 $ 2,554 $ (90,302) 83,179 279,760 (1,938) 301,739  
Balance (in shares) at Dec. 31, 2015 28,485,758 2,554,459 (8,884,024)          
Conversion of Class A Common Stock $ 214 $ (214)            
Conversion of Class A Common Stock (in shares) 214,400 (214,400)            
Stock compensation transactions, net $ 93              
Stock compensation transactions, net (in shares) 92,577              
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)     16,248          
Purchases     $ (21,282)          
Purchases (in shares)     (1,160,539)          
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    
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 28,792,735 2,340,059 (10,028,315)          
Conversion of Class A Common Stock $ 50 $ (50)            
Conversion of Class A Common Stock (in shares) 50,353 (50,353)            
Stock compensation transactions, net $ 107              
Stock compensation transactions, net (in shares) 107,149              
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)     7,812          
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)    
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 28,950,237 2,289,706 (10,020,503)