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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, 2018
Dec. 31, 2017
Shares Outstanding    
Number of shares outstanding, beginning balance (in shares) 11,403,341 12,222,282
Number of shares, granted (in shares) 5,302,586 6,320,457
Number of shares, vested (in shares) (5,485,868) (5,502,004)
Number of shares, forfeited (in shares) (1,018,399) (1,637,394)
Number of shares outstanding, ending balance (in shares) 10,201,660 11,403,341
Expected to vest (in shares) 9,236,535  
Weighted-Average Grant Date Fair Value    
Weighted-average grant date fair value, outstanding, beginning balance (in USD per share) $ 81.50 $ 63.66
Weighted-average grant date fair value, granted (in USD per share) 160.08 95.70
Weighted-average grant date fair value, vested (in USD per share) 77.38 60.79
Weighted-average grant date fair value, repurchased (in USD per share) 100.55 72.69
Weighted-average grant date fair value, outstanding, ending balance (in USD per share) $ 121.84 $ 81.50
Aggregate intrinsic value, vested $ 931,848 $ 573,861
Aggregate intrinsic value, outstanding 1,816,406  
Aggregated intrinsic value, expected to vest $ 1,644,565