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Consolidated Statement Of Changes In Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Beginning Balance at Dec. 31, 2011 $ 2,516,631 $ 1,833 $ 840,731 $ 2,279,367 $ 19,459 $ (624,759)
Beginning Balance (in shares) at Dec. 31, 2011 183,295,350 183,295,000        
Net income 240,618     240,618    
Foreign currency translation adjustment 3,804       3,804  
Issuance of restricted stock (in shares)   792,000        
Issuance of restricted stock   8 (8)      
Vesting of stock unit awards   8,000        
Forfeitures of restricted stock (in shares)   (90,000)        
Forfeitures of restricted stock   (1) 1      
Forfeitures of stock unit awards (in shares)   (1,000)        
Forfeitures of stock unit awards                  
Exercise of stock options (in shares) 17,800 18,000        
Exercise of stock options 260   260      
Stock-based compensation 17,203   17,203      
Tax expense related to stock-based compensation (1,206)   (1,206)      
Payment of cash dividends (22,956)     (22,956)    
Purchase of treasury stock (110,186)         (110,186)
Ending Balance at Sep. 30, 2012 $ 2,644,168 $ 1,840 $ 856,981 $ 2,497,029 $ 23,263 $ (734,945)
Ending Balance (in shares) at Sep. 30, 2012 184,021,577 184,022,000