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Stock-Based Plans (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of stock option plan activity The following table summarizes stock option activity for the nine months ended September 30, 2020:
 
Stock
Options
 
Weighted-average
Exercise Price
Stock Options outstanding at December 31, 2019
721,496

 
$
104.55

Granted
3,000

 
75.82

Exercised
(57,058
)
 
67.24

Forfeited
(245,100
)
 
122.31

Expired
(23,688
)
 
100.24

Stock Options outstanding at September 30, 2020
398,650

 
$
99.02
Summary of restricted stock activity The following table summarizes restricted stock activity for the nine months ended September 30, 2020:
 
Restricted
Stock
 
Weighted-average Grant
Date Fair Value
Restricted stock outstanding at December 31, 2019
406,802

 
$
76.27

Granted
97,775

 
74.93

Vested
(22,039
)
 
107.75

Forfeited
(54,366
)
 
96.90

Restricted stock outstanding at September 30, 2020
428,172

 
$
71.61