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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, 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   13,439       13,439
Exercise of stock options $ 4 6,498       6,502
Exercise of stock options (in shares) 669          
Unrealized gain on available-for- sale securities       215   215
ASU No. 2016-16 adoption | ASU 2016-16     (6,585)     (6,585)
Repurchase of common stock         $ (251,949) (251,949)
Repurchase of common stock (in shares)         (4,362)  
Foreign currency translation       2,723   2,723
Net income     216,050     216,050
Balance at Mar. 31, 2018 $ 3,150 4,170,565 3,137,691 (13,721) $ (3,422,078) 3,875,607
Balance (in shares) at Mar. 31, 2018 629,924       (67,319)  
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            
Unrealized gain on available-for- sale securities           728
Foreign currency translation           (9,265)
Net income           486,165
Balance at Jun. 30, 2018 $ 3,152 4,194,676 3,407,807 (25,196) $ (3,975,278) 3,605,161
Balance (in shares) at Jun. 30, 2018 630,330       (77,873)  
Balance at Mar. 31, 2018 $ 3,150 4,170,565 3,137,691 (13,721) $ (3,422,078) 3,875,607
Balance (in shares) at Mar. 31, 2018 629,924       (67,319)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   14,906       14,906
Exercise of stock options $ 2 7,112       7,114
Exercise of stock options (in shares) 406          
Unrealized gain on available-for- sale securities       513   513
Adjustment to excess tax benefits from prior periods   2,093       2,093
Repurchase of common stock         $ (553,200) (553,200)
Repurchase of common stock (in shares)         (10,554)  
Foreign currency translation       (11,988)   (11,988)
Net income     270,116     270,116
Balance at Jun. 30, 2018 $ 3,152 4,194,676 3,407,807 (25,196) $ (3,975,278) 3,605,161
Balance (in shares) at Jun. 30, 2018 630,330       (77,873)  
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 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, 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            
Unrealized gain on available-for- sale securities           335
Foreign currency translation           3,773
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          
Unrealized gain on available-for- sale securities       215   215
Repurchase of common stock         $ (621) (621)
Repurchase of common stock (in shares)         (10)  
Foreign currency translation       5,154   5,154
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)