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Consolidated Statements 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, 2009 $ 2,081,700 $ 1,808 $ 781,635 $ 1,901,853 $ 14,996 $ (618,592)
Beginning Balance (in shares) at Dec. 31, 2009   180,829,000        
Net income 116,942     116,942    
Foreign currency translation adjustment 6,601       6,601  
Issuance of restricted stock (in shares)   700,000        
Issuance of restricted stock   7 (7)      
Vesting of restricted stock units   7,000        
Forfeitures of restricted stock (in shares)   (59,000)        
Forfeitures of restricted stock   (1) 1      
Exercise of stock options (in shares)   61,000        
Exercise of stock options 525 1 524      
Stock-based compensation 16,779   16,779      
Tax expense/benefit related to stock-based compensation (2,291)   (2,291)      
Payment of cash dividends (30,796)     (30,796)    
Purchase of treasury stock (1,853)         (1,853)
Ending Balance at Dec. 31, 2010 2,187,607 1,815 796,641 1,987,999 21,597 (620,445)
Ending Balance (in shares) at Dec. 31, 2010   181,538,000        
Net income 322,413     322,413    
Foreign currency translation adjustment (2,138)       (2,138)  
Issuance of restricted stock (in shares)   782,000        
Issuance of restricted stock   8 (8)      
Vesting of restricted stock units   10,000        
Forfeitures of restricted stock (in shares)   (83,000)        
Forfeitures of restricted stock   (1) 1      
Exercise of stock options (in shares)   1,048,000        
Exercise of stock options 16,811 11 16,800      
Stock-based compensation 20,904   20,904      
Tax expense/benefit related to stock-based compensation 6,393   6,393      
Payment of cash dividends (31,045)     (31,045)    
Purchase of treasury stock (4,314)         (4,314)
Ending Balance at Dec. 31, 2011 2,516,631 1,833 840,731 2,279,367 19,459 (624,759)
Ending Balance (in shares) at Dec. 31, 2011 183,295,350 183,295,000        
Net income 299,477     299,477    
Foreign currency translation adjustment 2,308       2,308  
Issuance of restricted stock (in shares)   792,000        
Issuance of restricted stock   8 (8)      
Vesting of restricted stock units   8,000        
Forfeitures of restricted stock (in shares)   (99,000)        
Forfeitures of restricted stock   (1) 1      
Exercise of stock options (in shares) 63,800 64,000        
Exercise of stock options 934 1 933      
Stock-based compensation 23,185   23,185      
Tax expense/benefit related to stock-based compensation (1,284)   (1,284)      
Payment of cash dividends (30,302)     (30,302)    
Purchase of treasury stock (170,292)         (170,292)
Ending Balance at Dec. 31, 2012 $ 2,640,657 $ 1,841 $ 863,558 $ 2,548,542 $ 21,767 $ (795,051)
Ending Balance (in shares) at Dec. 31, 2012 184,059,900 184,060,000