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Consolidated Statements of STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
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
Balance at Dec. 31, 2012 $ 27,212 $ 3,297 $ (75,816) $ 73,803 $ 254,310 $ (23,378)  
Balance (in shares) at Dec. 31, 2012 27,212,184 3,297,433 (8,263,557)        
Conversion of Class A Common Stock $ 382 $ (382)          
Conversion of Class A Common Stock (in shares) 382,199 (382,199)          
Stock compensation transactions, net $ 259            
Stock compensation transactions, net (in shares) 259,029            
Stock option and restricted stock issuances       (1,928)      
Tax benefit related to stock-based plans       1,754      
Directors Compensation Plan     $ 96 454      
Directors Compensation Plan (in shares)     10,143        
Purchases     $ 0       $ 0
Purchases (in shares)     0        
Amortization of restricted stock       3,323      
Net income         32,265   32,265
Cash dividends         (5,353)    
Pension liabilities adjustment, net of taxes           7,966  
Balance at Dec. 31, 2013 $ 27,853 $ 2,915 $ (75,720) 77,406 281,222 (15,412) 298,264
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 benefit related to stock-based plans       896      
Directors Compensation Plan     $ 88 337      
Directors Compensation Plan (in shares)     9,213        
Purchases     $ (804)       804
Purchases (in shares)     (37,076)        
Amortization of restricted stock       3,319      
Net income         8,589   8,589
Cash dividends         (29,780)    
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 benefit related to stock-based plans       253      
Directors Compensation Plan     $ 136 479      
Directors Compensation Plan (in shares)     14,274        
Purchases     $ (14,002)       14,002
Purchases (in shares)     (617,021)        
Amortization of restricted stock       4,033      
Net income         27,789   27,789
Cash dividends         (8,060)    
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)