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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' equity, beginning balance at Dec. 31, 2010 $ 1,068,797 $ 1,511 $ 970,068 $ 2,618,479 $ (2,509,466) $ (11,795)
Number of common shares, beginning balance at Dec. 31, 2010 151,054          
Net income 432,968     432,968    
Other comprehensive income (loss) (24,260)         (24,260)
Issuance of common stock for Employee Stock Purchase Plan 4,150 1 4,149      
Issuance of common stock for Employee Stock Purchase Plan, shares 58          
Issuance of common stock for stock options exercised 56,003 14 55,989      
Issuance of common stock for stock options exercised, shares 1,381          
Tax benefit related to stock option plans 32,239   32,239      
(Increase in) release of valuation allowance 176   176      
Treasury stock (370,835)       (370,835)  
Stock-based compensation 27,340 2 27,338      
Stock-based compensation, shares 264          
Stockholders' equity, ending balance at Dec. 31, 2011 1,226,578 1,528 1,089,959 3,051,447 (2,880,301) (36,055)
Number of common shares, ending balance at Dec. 31, 2011 152,757          
Net income 461,443     461,443    
Other comprehensive income (loss) 9,660         9,660
Issuance of common stock for Employee Stock Purchase Plan 4,661 1 4,660      
Issuance of common stock for Employee Stock Purchase Plan, shares 66          
Issuance of common stock for stock options exercised 24,208 6 24,202      
Issuance of common stock for stock options exercised, shares 630          
Tax benefit related to stock option plans 10,568   10,568      
(Increase in) release of valuation allowance (2,354)   (2,354)      
Treasury stock (295,878)       (295,878)  
Stock-based compensation 28,471 2 28,469      
Stock-based compensation, shares 243          
Stockholders' equity, ending balance at Dec. 31, 2012 1,467,357 1,537 1,155,504 3,512,890 (3,176,179) (26,395)
Number of common shares, ending balance at Dec. 31, 2012 153,696          
Net income 450,003     450,003    
Other comprehensive income (loss) 32,274         32,274
Issuance of common stock for Employee Stock Purchase Plan 4,817 1 4,816      
Issuance of common stock for Employee Stock Purchase Plan, shares 58          
Issuance of common stock for stock options exercised 64,141 13 64,128      
Issuance of common stock for stock options exercised, shares 1,281          
Tax benefit related to stock option plans 15,842   15,842      
(Increase in) release of valuation allowance (892)   (892)      
Treasury stock (301,580)       (301,580)  
Stock-based compensation 31,211 1 31,210      
Stock-based compensation, shares 211          
Stockholders' equity, ending balance at Dec. 31, 2013 $ 1,763,173 $ 1,552 $ 1,270,608 $ 3,962,893 $ (3,477,759) $ 5,879
Number of common shares, ending balance at Dec. 31, 2013 155,246