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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - 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]
Beginning balance at Dec. 31, 2017 $ 2,233,788 $ 1,598 $ 1,745,088 $ 5,405,380 $ (4,808,211) $ (110,067)
Beginning Balance, shares at Dec. 31, 2017   159,845        
Adoption of new accounting pronouncement (3,969)     (3,969)    
Net income 593,794     593,794    
Other comprehensive income (loss) (7,904)         (7,904)
Issuance of common stock for Employee Stock Purchase Plan 7,874   7,874      
Issuance of common stock for Employee Stock Purchase Plan, shares   45        
Issuance of common stock for stock options exercised 44,555 $ 5 44,550      
Issuance of common stock for stock options exercised, shares   438        
Treasury stock (1,338,111)       (1,338,111)  
Stock-based compensation 37,231 $ 2 37,229      
Stock-based compensation, shares   144        
Ending balance at Dec. 31, 2018 1,567,258 $ 1,605 1,834,741 5,995,205 (6,146,322) (117,971)
Ending Balance, shares at Dec. 31, 2018   160,472        
Net income 592,198     592,198    
Other comprehensive income (loss) (1,500)         (1,500)
Issuance of common stock for Employee Stock Purchase Plan 7,996   7,996      
Issuance of common stock for Employee Stock Purchase Plan, shares   43        
Issuance of common stock for stock options exercised 45,719 $ 4 45,715      
Issuance of common stock for stock options exercised, shares   406        
Treasury stock (2,466,254)       (2,466,254)  
Stock-based compensation 38,302 $ 1 38,301      
Stock-based compensation, shares   109        
Ending balance at Dec. 31, 2019 (216,281) $ 1,610 1,926,753 6,587,403 (8,612,576) (119,471)
Ending Balance, shares at Dec. 31, 2019   161,030        
Adoption of new accounting pronouncement (985)     (985)    
Net income 521,571     521,571    
Other comprehensive income (loss) 1,528         1,528
Issuance of common stock for Employee Stock Purchase Plan 7,531   7,531      
Issuance of common stock for Employee Stock Purchase Plan, shares   43        
Issuance of common stock for stock options exercised 58,502 $ 5 58,497      
Issuance of common stock for stock options exercised, shares   456        
Treasury stock (176,408)       (176,408)  
Stock-based compensation 36,686 $ 2 36,684      
Stock-based compensation, shares   137        
Ending balance at Dec. 31, 2020 $ 232,144 $ 1,617 $ 2,029,465 $ 7,107,989 $ (8,788,984) $ (117,943)
Ending Balance, shares at Dec. 31, 2020   161,666