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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, 2016 $ 3,116 $ 4,051,245 $ 2,107,548 $ (23,249) $ (2,808,951) $ 3,329,709
Balance (in shares) at Dec. 31, 2016 623,201       (56,635)  
Increase (Decrease) in Stockholders' Equity            
Stock-based compensation   52,282       52,282
Exercise of stock options $ 30 52,596       52,626
Exercise of stock options (in shares) 6,054          
Unrealized gain (loss) on available-for- sale securities       (648)   (648)
Reversal of excess tax benefits from share based payment arrangements   (5,495)       (5,495)
Repurchase of common stock         $ (361,178) (361,178)
Repurchase of common stock (in shares)         (6,322)  
Foreign currency translation       7,238   7,238
Net income     820,678     820,678
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 (loss) 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 (loss) 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)