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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Balance at Dec. 31, 2008 $ 1,079,202 $ 1,047 $ 681,067 $ 1,208,009 $ (810,921)
Balance, shares at Dec. 31, 2008   104,769      
Net earnings 167,855     167,855  
Other comprehensive income:          
Foreign currency translation adjustment 2,295     2,295  
Comprehensive income 170,150        
Purchase of treasury stock (8,846)   (13)   (8,833)
Exercise of stock options 1,537 2 1,535    
Exercise of stock options, shares   142      
Tax benefit related to stock option exercises 270   270    
Stock-based compensation 3,731   3,731    
Other 1,470   2 1,468  
Balance at Dec. 31, 2009 1,247,514 1,049 686,592 1,379,627 (819,754)
Balance, shares at Dec. 31, 2009   104,911      
Net earnings 171,642     171,642  
Other comprehensive income:          
Foreign currency translation adjustment 950     950  
Comprehensive income 172,592        
Purchase of treasury stock (84,592)   (72)   (84,520)
Exercise of stock options 19,040 11 19,029    
Exercise of stock options, shares   1,080      
Tax benefit related to stock option exercises 2,974   2,974    
Stock-based compensation 4,123   4,123    
Dividends (7,804)     (7,804)  
Other (48)   (46) (2)  
Balance at Dec. 31, 2010 1,353,799 1,060 712,600 1,544,413 (904,274)
Balance, shares at Dec. 31, 2010   105,991      
Net earnings 164,637     164,637  
Other comprehensive income:          
Foreign currency translation adjustment (3,992)     (3,992)  
Comprehensive income 160,645        
Purchase of treasury stock (164,285)   (116)   (164,169)
Exercise of stock options 34,910 17 34,893    
Exercise of stock options, shares   1,809      
Tax benefit related to stock option exercises 7,036   7,036    
Stock-based compensation 4,471   4,471    
Dividends (36,357)     (36,357)  
Other (1,010)   (951) (59)   
Balance at Dec. 31, 2011 $ 1,359,209 $ 1,077 $ 757,933 $ 1,668,642 $ (1,068,443)
Balance, shares at Dec. 31, 2011   107,800