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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 Loss
Treasury stock
Total
Balance at Dec. 31, 2017 $ 3,146 $ 4,150,628 $ 2,928,226 $ (16,659) $ (3,170,129) $ 3,895,212
Balance (in shares) at Dec. 31, 2017 629,255       (62,957)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   57,111       57,111
Exercise of stock options $ 9 27,843       27,852
Exercise of stock options (in shares) 1,715          
Unrealized gain, net on available-for-sale securities       752   752
Adjustment to excess tax benefits from prior periods   2,588       2,588
ASU No. 2016-16 adoption     (6,585)     (6,585)
Repurchase of common stock         $ (1,342,076) (1,342,076)
Repurchase of common stock (in shares)         (24,337)  
Foreign currency translation       (16,957)   (16,957)
Net income     993,004     993,004
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 loss, 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)