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Stockholder's Equity - Nonvested Stock Activity (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Restricted stock  
Number of shares  
Share grants outstanding, beginning balance | shares 534,331
Granted (in shares) | shares 135,090
Vested (in shares) | shares (185,910)
Share grants outstanding, ending balance | shares 483,511
Weighted average grant date fair value  
Beginning balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 71.01
Granted (in dollars per share) | $ / shares 123.10
Vested (in dollars per share) | $ / shares 61.79
Ending balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 88.90
Options  
Number of shares  
Share grants outstanding, beginning balance | shares 98,756
Granted (in shares) | shares 0
Vested or exercised (in shares) | shares (7,137)
Share grants outstanding, ending balance | shares 91,619
Weighted average grant date fair value  
Share grants outstanding, beginning balance (in dollars per share) | $ / shares $ 40.71
Granted (in dollars per share) | $ / shares 0
Vested or exercised (in dollars per share) | $ / shares 30.62
Share grants outstanding, ending balance (in dollars per share) | $ / shares $ 39.97