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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ 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, 2012 $ 1,467,357 $ 1,537 $ 1,155,504 $ 3,512,890 $ (3,176,179) $ (26,395)
Number of common shares, beginning balance at Dec. 31, 2012 153,696          
Net income $ 450,003     450,003    
Other comprehensive (loss) income 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 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          
Net income $ 431,620     431,620    
Other comprehensive (loss) income (84,584)         (84,584)
Issuance of common stock for Employee Stock Purchase Plan $ 5,028 1 5,027      
Issuance of common stock for Employee Stock Purchase Plan, shares 54          
Issuance of common stock for stock options exercised $ 68,821 12 68,809      
Issuance of common stock for stock options exercised, shares 1,185          
Tax benefit related to stock option plans $ 15,703   15,703      
Treasury stock (337,444)       (337,444)  
Stock-based compensation $ 32,349 2 32,347      
Stock-based compensation, shares 231          
Stockholders' equity, ending balance at Dec. 31, 2014 $ 1,894,666 1,567 1,392,494 4,394,513 (3,815,203) (78,705)
Number of common shares, ending balance at Dec. 31, 2014 156,716          
Net income $ 469,053     469,053    
Other comprehensive (loss) income (68,021)         (68,021)
Issuance of common stock for Employee Stock Purchase Plan $ 5,496 1 5,495      
Issuance of common stock for Employee Stock Purchase Plan, shares 53          
Issuance of common stock for stock options exercised $ 46,564 7 46,557      
Issuance of common stock for stock options exercised, shares 727          
Tax benefit related to stock option plans $ 12,955   12,955      
Treasury stock (334,705)       (334,705)  
Stock-based compensation $ 32,843 2 32,841      
Stock-based compensation, shares 181          
Stockholders' equity, ending balance at Dec. 31, 2015 $ 2,058,851 $ 1,577 $ 1,490,342 $ 4,863,566 $ (4,149,908) $ (146,726)
Number of common shares, ending balance at Dec. 31, 2015 157,677