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Equity Awards - Restricted Stock Unit Table (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Number of shares outstanding, beginning balance (in shares) 10,202,000 11,403,000  
Number of shares, granted (in shares) 5,338,000 5,303,000  
Number of shares, vested (in shares) (5,487,000) (5,486,000)  
Number of shares, forfeited (in shares) (1,320,000) (1,018,000)  
Number of shares outstanding, ending balance (in shares) 8,733,000 10,202,000 11,403,000
Expected to vest as of December 31, 2019 (in shares) 7,506,000    
Weighted-Average Grant Date Fair Value      
Weighted-average grant date fair value, outstanding, beginning balance (in USD per share) $ 121.84 $ 81.50  
Weighted-average grant date fair value, granted (in USD per share) 240.32 160.08  
Weighted-average grant date fair value, vested (in USD per share) 126.85 77.38  
Weighted-average grant date fair value, repurchased (in USD per share) 145.34 100.55  
Weighted-average grant date fair value, outstanding, ending balance (in USD per share) $ 185.39 $ 121.84 $ 81.50
Aggregate intrinsic value, vested $ 1,369,918 $ 931,848 $ 573,900
Aggregate intrinsic value, outstanding 2,465,387    
Aggregated intrinsic value, expected to vest $ 2,119,197