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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, 2013 $ 27,853 $ 2,915 $ (75,720) $ 77,406 $ 281,222 $ (15,412)    
Balance (in shares) at Dec. 31, 2013 27,853,412 2,915,234 (8,253,414)          
Conversion of Class A Common Stock $ 312 $ (312)            
Conversion of Class A Common Stock (in shares) 311,824 (311,824)            
Stock compensation transactions, net $ 162              
Stock compensation transactions, net (in shares) 161,534              
Stock option and restricted stock issuances       (2,232)        
Tax (cost) benefit related to stock-based plans       896        
Directors Compensation Plan     $ 88 337        
Directors Compensation Plan (in shares)     9,213          
Purchases     $ (804)          
Purchases (in shares)     (37,076)          
Amortization of restricted stock       3,319        
Net income         8,589   $ 8,589 $ 732
Cash dividends         (29,780)     (2,703)
Pension liabilities adjustment, net of taxes           13,244    
Balance at Dec. 31, 2014 $ 28,327 $ 2,603 $ (76,436) 79,726 260,031 (2,168) 292,083  
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 2,436
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 2,551
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)