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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2018 $ 3,155 $ 4,238,170 $ 3,914,645 $ (32,864) $ (4,512,205) $ 3,610,901
Balance (in shares) at Dec. 31, 2018 630,970       (87,294)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   63,356       63,356
Exercise of stock options $ 27 92,336       92,363
Exercise of stock options (in shares) 5,490          
Unrealized gain, net on available-for-sale securities       283   283
Adjustment to excess tax benefits from prior periods   3,649       3,649
Repurchase of common stock         $ (707,300) (707,300)
Repurchase of common stock (in shares)         (12,468)  
Foreign currency translation       194   194
Net income     1,107,835     1,107,835
Balance at Dec. 31, 2019 $ 3,182 4,397,511 5,022,480 (32,387) $ (5,219,505) 4,171,281
Balance (in shares) at Dec. 31, 2019 636,460       (99,762)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   67,546       67,546
Exercise of stock options $ 11 72,925       72,936
Exercise of stock options (in shares) 2,202          
Unrealized gain, net on available-for-sale securities       110   110
Repurchase of common stock         $ (595,918) (595,918)
Repurchase of common stock (in shares)         (10,803)  
Foreign currency translation       35,531   (35,531)
Net income     1,409,594     1,409,594
Balance at Dec. 31, 2020 $ 3,193 4,537,982 6,432,074 3,034 $ (5,815,423) 5,160,860
Balance (in shares) at Dec. 31, 2020 638,662       (110,565)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   68,922       68,922
Exercise of stock options $ 7 45,716       45,723
Exercise of stock options (in shares) 1,381          
Unrealized loss, net on available-for-sale securities       (1,041)   (1,041)
Repurchase of common stock         $ (13,830) (13,830)
Repurchase of common stock (in shares)         (155)  
Foreign currency translation       (71,158)   (71,158)
Net income     1,377,475     1,377,475
Balance at Dec. 31, 2021 $ 3,200 $ 4,652,620 $ 7,809,549 $ (69,165) $ (5,829,253) $ 6,566,951
Balance (in shares) at Dec. 31, 2021 640,043       (110,720)