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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 [Member]
Stockholders' equity, beginning 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, beginning balance at Dec. 31, 2014 156,716          
Net income $ 469,053     469,053    
Other comprehensive income (loss) (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          
Net income $ 521,503     521,503    
Other comprehensive income (loss) (69,554)         (69,554)
Issuance of common stock for Employee Stock Purchase Plan $ 6,278 1 6,277      
Issuance of common stock for Employee Stock Purchase Plan, shares 53          
Issuance of common stock for stock options exercised $ 55,911 7 55,904      
Issuance of common stock for stock options exercised, shares 730          
Tax benefit related to stock option plans $ 13,844   13,844      
Treasury stock (325,759)       (325,759)  
Stock-based compensation $ 40,875 1 40,874      
Stock-based compensation, shares 174          
Stockholders' equity, ending balance at Dec. 31, 2016 $ 2,301,949 1,586 1,607,241 5,385,069 (4,475,667) (216,280)
Number of common shares, ending balance at Dec. 31, 2016 158,634          
Net income $ 20,311     20,311    
Other comprehensive income (loss) 106,213         106,213
Issuance of common stock for Employee Stock Purchase Plan $ 6,875 1 6,874      
Issuance of common stock for Employee Stock Purchase Plan, shares 50          
Issuance of common stock for stock options exercised $ 90,914 10 90,904      
Issuance of common stock for stock options exercised, shares 972          
Treasury stock $ (332,544)       (332,544)  
Stock-based compensation $ 40,070 1 40,069      
Stock-based compensation, shares 189          
Stockholders' equity, ending balance at Dec. 31, 2017 $ 2,233,788 $ 1,598 $ 1,745,088 $ 5,405,380 $ (4,808,211) $ (110,067)
Number of common shares, ending balance at Dec. 31, 2017 159,845