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Stock-Based Awards and Other Equity Instruments - Summary of Restricted Stock Units Activity (Details) - RSUs - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
RSUs      
Beginning balance (in shares) 2,761 1,941 1,349
Granted (in shares) 2,937 1,821 1,350
Vested (in shares) (952) (615) (492)
Cancelled (in shares) (616) (386) (266)
Ending balance (in shares) 4,130 2,761 1,941
Weighted Average Grant-Date Fair Value      
Beginning balance (in dollars per share) $ 113.12 $ 120.19 $ 114.58
Granted (in dollars per share) 121.39 107.37 123.24
Vested (in dollars per share) 114.33 118.41 115.29
Cancelled (in dollars per share) 117.54 113.55 116.26
Ending balance (in dollars per share) $ 117.05 $ 113.12 $ 120.19