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Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs and PSUs
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Shares  
Unvested, beginning balance (in shares) | shares 483
Granted (in shares) | shares 194
Vested (in shares) | shares (158)
Forfeited (in shares) | shares (21)
Unvested, ending balance (in shares) | shares 498
Weighted Average Grant Date Fair Value per Share  
Unvested, beginning balance (in dollars per share) | $ / shares $ 80.20
Granted (in dollars per share) | $ / shares 140.30
Vested (in dollars per share) | $ / shares 60.18
Forfeited (in dollars per share) | $ / shares 105.98
Unvested, ending balance (in dollars per share) | $ / shares $ 108.77