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CONDENSED 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, 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   15,324       15,324
Exercise of stock options $ 19 35,144       35,163
Exercise of stock options (in shares) 3,871          
Repurchase of common stock         $ (222,792) (222,792)
Repurchase of common stock (in shares)         (4,000)  
Change in foreign currency translation adjustment       (1,381)   (1,381)
Change in net unrealized gains       120   120
Net income     261,485     261,485
Balance at Mar. 31, 2019 $ 3,174 4,288,638 4,176,130 (34,125) $ (4,734,997) 3,698,820
Balance (in shares) at Mar. 31, 2019 634,841       (91,294)  
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            
Change in foreign currency translation adjustment           3,773
Change in net unrealized gains           335
Net income           553,958
Balance at Jun. 30, 2019 $ 3,180 4,350,177 4,468,603 (28,756) $ (4,735,618) 4,057,586
Balance (in shares) at Jun. 30, 2019 636,129       (91,304)  
Balance at Mar. 31, 2019 $ 3,174 4,288,638 4,176,130 (34,125) $ (4,734,997) 3,698,820
Balance (in shares) at Mar. 31, 2019 634,841       (91,294)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   15,575       15,575
Exercise of stock options $ 6 45,964       45,970
Exercise of stock options (in shares) 1,288          
Repurchase of common stock         $ (621) (621)
Repurchase of common stock (in shares)         (10)  
Change in foreign currency translation adjustment       5,154   5,154
Change in net unrealized gains       215   215
Net income     292,473     292,473
Balance at Jun. 30, 2019 $ 3,180 4,350,177 4,468,603 (28,756) $ (4,735,618) 4,057,586
Balance (in shares) at Jun. 30, 2019 636,129       (91,304)  
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   17,098       17,098
Exercise of stock options $ 4 13,971       13,975
Exercise of stock options (in shares) 644          
Unrealized gain, net on available-for-sale securities       304   304
Repurchase of common stock         $ (579,948) (579,948)
Repurchase of common stock (in shares)         (10,503)  
Change in foreign currency translation adjustment       (30,599)   (30,599)
Net income     278,835     278,835
Balance at Mar. 31, 2020 $ 3,186 4,428,580 5,301,315 (62,682) $ (5,799,453) 3,870,946
Balance (in shares) at Mar. 31, 2020 637,104       (110,265)  
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            
Change in foreign currency translation adjustment           (21,555)
Change in net unrealized gains           504
Net income           590,204
Balance at Jun. 30, 2020 $ 3,190 4,474,379 5,612,684 (53,438) $ (5,815,275) 4,221,540
Balance (in shares) at Jun. 30, 2020 637,924       (110,563)  
Balance at Mar. 31, 2020 $ 3,186 4,428,580 5,301,315 (62,682) $ (5,799,453) 3,870,946
Balance (in shares) at Mar. 31, 2020 637,104       (110,265)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   15,936       15,936
Exercise of stock options $ 4 29,863       29,867
Exercise of stock options (in shares) 820          
Repurchase of common stock         $ (15,822) (15,822)
Repurchase of common stock (in shares)         (298)  
Change in foreign currency translation adjustment       9,044   9,044
Change in net unrealized gains       200   200
Net income     311,369     311,369
Balance at Jun. 30, 2020 $ 3,190 $ 4,474,379 $ 5,612,684 $ (53,438) $ (5,815,275) $ 4,221,540
Balance (in shares) at Jun. 30, 2020 637,924       (110,563)