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Consolidated Condensed 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, 2013 $ 2,755,997 $ 1,865 $ 913,505 $ 2,707,439 $ 14,076 $ (880,888)
Beginning Balance (in shares) at Dec. 31, 2013 186,487,246 186,487,000        
Net income 34,822     34,822    
Foreign currency translation adjustment (3,355)       (3,355)  
Issuance of restricted stock   15,000        
Forfeitures of restricted stock (in shares)   (13,000)        
Forfeitures of restricted stock                  
Exercise of stock options (in shares) 482,500 483,000        
Exercise of stock options 8,033 5 8,028      
Stock-based compensation 6,711   6,711      
Tax benefit related to stock-based compensation 1,961   1,961      
Payment of cash dividends (14,456)     (14,456)    
Purchase of treasury stock (43)         (43)
Ending Balance at Mar. 31, 2014 $ 2,789,670 $ 1,870 $ 930,205 $ 2,727,805 $ 10,721 $ (880,931)
Ending Balance (in shares) at Mar. 31, 2014 186,971,989 186,972,000