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Stock-Based Compensation - RSUs (Details) - RSUs
shares in Thousands
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Number of Units  
Outstanding, beginning balance (in shares) | shares 14,292
Granted (in shares) | shares 9,357
Vested (in shares) | shares (6,439)
Forfeited (in shares) | shares (1,175)
Outstanding, ending balance (in shares) | shares 16,035
Weighted Average Grant Date Fair Value Per Unit  
Unvested, beginning balance (in dollars per share) | $ / shares $ 23.70
Granted (in dollars per share) | $ / shares 20.64
Vested (in dollars per share) | $ / shares 25.10
Forfeited (in dollars per share) | $ / shares 21.98
Unvested, ending balance (in dollars per share) | $ / shares $ 21.50