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Stock-Based Compensation - Restricted Stock Units (Details) - RSUs and PSUs
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of Shares  
Unvested, beginning balance (in shares) | shares 646
Granted (in shares) | shares 174
Vested (in shares) | shares (268)
Forfeited (in shares) | shares (69)
Unvested, ending balance (in shares) | shares 483
Weighted Average Grant Date Fair Value per Share  
Unvested, beginning balance (usd per share) | $ / shares $ 52.42
Granted (usd per share) | $ / shares 112.24
Vested (usd per share) | $ / shares 36.58
Forfeited (usd per share) | $ / shares 70.52
Unvested, ending balance (usd per share) | $ / shares $ 80.20