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Stockholder's Equity - Nonvested Stock Activity (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Restricted stock  
Number of shares  
Share grants outstanding, beginning balance | shares 469,631
Granted (in shares) | shares 118,495
Vested (in shares) | shares (146,645)
Share grants outstanding, ending balance | shares 441,481
Weighted average grant date fair value  
Beginning balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 89.69
Granted (in dollars per share) | $ / shares 185.00
Vested (in dollars per share) | $ / shares 185.61
Ending balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 119.64
Options  
Number of shares  
Share grants outstanding, beginning balance | shares 74,235
Granted (in shares) | shares 0
Vested or exercised (in shares) | shares 0
Share grants outstanding, ending balance | shares 74,235
Weighted average grant date fair value  
Share grants outstanding, beginning balance (in dollars per share) | $ / shares $ 42.07
Granted (in dollars per share) | $ / shares 0
Vested or exercised (in dollars per share) | $ / shares 0
Share grants outstanding, ending balance (in dollars per share) | $ / shares $ 42.07