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Stockholder's Equity - Nonvested Stock Activity (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Restricted stock  
Number of shares  
Share grants outstanding as of December 31, 2018 | shares 574,285
Granted (in shares) | shares 163,995
Vested (in shares) | shares (220,691)
Share grants outstanding as of September 30, 2019 | shares 517,589
Weighted average grant date fair value  
Beginning balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 49.68
Granted (in dollars per share) | $ / shares 109.65
Vested (in dollars per share) | $ / shares 45.02
Ending balance, Weighted average grant date fair value (in dollars per share) | $ / shares $ 69.50
Options  
Number of shares  
Share grants outstanding as of December 31, 2018 | shares 161,807
Granted (in shares) | shares 0
Vested or exercised (in shares) | shares (56,738)
Share grants outstanding as of September 30, 2019 | shares 105,069
Weighted average grant date fair value  
Share grants outstanding as of December 31, 2018 (in dollars per share) | $ / shares $ 38.08
Granted (in dollars per share) | $ / shares 0
Vested or exercised (in dollars per share) | $ / shares 31.64
Share grants outstanding as of September 30, 2019 (in dollars per share) | $ / shares $ 40.64