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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, 2012 $ 2,640,657 $ 1,841 $ 863,558 $ 2,548,542 $ 21,767 $ (795,051)
Beginning Balance (in shares) at Dec. 31, 2012 184,059,900 184,060,000        
Net income 56,230     56,230    
Foreign currency translation adjustment (2,303)       (2,303)  
Issuance of restricted stock (in shares)   18,000        
Issuance of restricted stock 0          
Forfeitures of restricted stock (in shares)   (16,000)        
Forfeitures of restricted stock 0          
Exercise of stock options (in shares) 1,150,000 1,150,000        
Exercise of stock options 18,622 11 18,611      
Stock-based compensation 5,903   5,903      
Tax benefit related to stock-based compensation 2,737   2,737      
Payment of cash dividends (7,312)     (7,312)    
Purchase of treasury stock (15,201)         (15,201)
Ending Balance at Mar. 31, 2013 $ 2,699,333 $ 1,852 $ 890,809 $ 2,597,460 $ 19,464 $ (810,252)
Ending Balance (in shares) at Mar. 31, 2013 185,212,330 185,212,000