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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, 2018 $ 1,567,258 $ 1,605 $ 1,834,741 $ 5,995,205 $ (6,146,322) $ (117,971)
Beginning 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        
Net income 692,843     692,843    
Other comprehensive income (loss) 6,078         6,078
Issuance of common stock for Employee Stock Purchase Plan 9,578   9,578      
Issuance of common stock for Employee Stock Purchase Plan, shares   40        
Issuance of common stock for stock options exercised 46,065 $ 3 46,062      
Issuance of common stock for stock options exercised, shares   282        
Treasury stock (648,930)       (648,930)  
Stock-based compensation 29,776 $ 1 29,775      
Stock-based compensation, shares   96        
Ending balance at Dec. 31, 2021 $ 367,554 $ 1,621 $ 2,114,880 $ 7,800,832 $ (9,437,914) $ (111,865)
Ending Balance, shares at Dec. 31, 2021   162,084