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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-in Capital [Member]
Earnings Reinvested in the Business [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning Balance at Dec. 31, 2010 $ 5,396 $ 89,027 $ 991,094 $ (87,102) $ (14,630)  
Beginning Balance (in shares) at Dec. 31, 2010       4,345,712    
Net earnings     120,484     120,484
Other comprehensive income         (24,418)  
Cash dividends paid     (41,968)      
Share-based compensation   7,819        
Stock options exercised   242   2,412    
Stock options exercised (in shares)       (120,368)    
Nonvested stock issued upon vesting   (3,526)   3,526    
Nonvested stock issued upon vesting (in shares)       (175,972)    
Benefit plans   148   229    
Benefit plans (in shares)       (11,361)    
Other   477        
Ending Balance at Dec. 31, 2011 5,396 94,187 1,069,610 (80,935) (39,048)  
Ending Balance (in shares) at Dec. 31, 2011       4,038,011    
Net earnings     123,908     123,908
Other comprehensive income         34,463  
Cash dividends paid     (43,426)      
Share-based compensation   10,086        
Stock options exercised   52   1,438    
Stock options exercised (in shares)       (66,579)    
Nonvested stock issued upon vesting   (6,999)   6,999    
Nonvested stock issued upon vesting (in shares)       (313,812)    
Benefit plans   388   480    
Benefit plans (in shares)       (22,925)    
Purchase of treasury stock       (23,154)    
Purchase of treasury stock (in shares)       626,251    
Other   539   (86)    
Other (in shares)       3,875    
Ending Balance at Dec. 31, 2012 5,396 98,253 1,150,092 (95,258) (4,585) 1,153,898
Ending Balance (in shares) at Dec. 31, 2012       4,264,821    
Net earnings     113,295     113,295
Other comprehensive income         10,587  
Cash dividends paid     (45,513)      
Share-based compensation   8,430        
Stock options exercised   (63)   1,063    
Stock options exercised (in shares)       (47,584)    
Nonvested stock issued upon vesting   (2,113)   2,113    
Nonvested stock issued upon vesting (in shares)       (94,600)    
Benefit plans   385   595    
Benefit plans (in shares)       (26,635)    
Other   227   (220)    
Other (in shares)       9,825    
Ending Balance at Dec. 31, 2013 $ 5,396 $ 105,119 $ 1,217,874 $ (91,707) $ 6,002 $ 1,242,684
Ending Balance (in shares) at Dec. 31, 2013       4,105,827