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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          
Unrealized gain, net on available-for- sale securities       120   120
Repurchase of common stock         $ (222,792) (222,792)
Repurchase of common stock (in shares)         (4,000)  
Foreign currency translation       (1,381)   (1,381)
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, 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)  
Foreign currency translation       (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)