XML 66 R39.htm IDEA: XBRL DOCUMENT v3.20.1
Stockholder's Equity - Nonvested Stock Activity (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Restricted stock  
Number of shares  
Share grants outstanding, beginning balance | shares 534,331
Granted (in shares) | shares 130,275
Vested (in shares) | shares (163,923)
Share grants outstanding, ending balance | shares 500,683
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 123.01
Vested (in dollars per share) | $ / shares 121.65
Ending balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 87.67
Options  
Number of shares  
Share grants outstanding, beginning balance | shares 98,756
Granted (in shares) | shares 0
Vested or exercised (in shares) | shares 0
Share grants outstanding, ending balance | shares 98,756
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 0
Share grants outstanding, ending balance (in dollars per share) | $ / shares $ 40.71