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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock and Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning Balance at Dec. 31, 2016 $ 2,679,800 $ 1,599,762 $ (48,565) $ 1,128,603
Beginning Balance (in shares) at Dec. 31, 2016   430,054,212    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 558,929     558,929
Other comprehensive income (loss) 28,008   28,008  
Issuance of common stock upon exercise of options $ 89,425 $ 89,425    
Issuance of common stock upon exercise of options (in shares) 3,338,474 3,338,474    
Stock-based compensation expense $ 182,209 $ 182,209    
Ending Balance at Dec. 31, 2017 3,581,956 $ 1,871,396 (20,557) 1,731,117
Ending Balance (in shares) at Dec. 31, 2017   433,392,686    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 1,211,242     1,211,242
Other comprehensive income (loss) 975   975  
Issuance of common stock upon exercise of options $ 123,935 $ 123,935    
Issuance of common stock upon exercise of options (in shares) 3,205,911 3,205,911    
Stock-based compensation expense $ 320,657 $ 320,657    
Ending Balance at Dec. 31, 2018 5,238,765 $ 2,315,988 (19,582) 2,942,359
Ending Balance (in shares) at Dec. 31, 2018   436,598,597    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 1,866,916     1,866,916
Other comprehensive income (loss) (3,939)   (3,939)  
Issuance of common stock upon exercise of options $ 72,565 $ 72,565    
Issuance of common stock upon exercise of options (in shares) 2,208,052 2,208,052    
Stock-based compensation expense $ 405,376 $ 405,376    
Ending Balance at Dec. 31, 2019 $ 7,582,157 $ 2,793,929 $ (23,521) $ 4,811,749
Ending Balance (in shares) at Dec. 31, 2019   438,806,649