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Share-Based Compensation - Restricted Stock Units Activity (Details) - Restricted Stock
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 111,300
Granted (in shares) | shares 39,530
Vested (in shares) | shares (34,680)
Forfeited (in shares) | shares (8,675)
Ending balance (in shares) | shares 107,475
Weighted-Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 147.13
Granted (in dollars per share) | $ / shares 206.53
Vested (in dollars per share) | $ / shares 140.73
Forfeited (in dollars per share) | $ / shares 170.22
Ending balance (in dollars per share) | $ / shares $ 169.58