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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Stock Options Plan [Member]  
Summary of Transactions of Company's Stock Option Plans
The following table summarizes the transactions of the Company’s stock option plans for the three months ended March 31, 2020:
 
Number
of
Options
 
  
Weighted
Average
Exercise
Price
 
  
Weighted
Average
Grant-
Date Fair
Value
 
Outstanding at December 31, 2019
   
504,459
     $
33.05
     $
41.35
  
Granted – at discount
   
61,678
     $
0.00
     $
77.83
  
– at market value
   
10,419
     $
95.70
     $
18.69
  
Exercised
   
(74,074
 )   $
9.11
     $
52.83
  
Forfeited
   
(10,250
 )   $
13.80
     $
47.17
  
                         
Outstanding at March 31, 2020
   
492,232
     $
34.24
     $
43.59
  
                         
Stock Equivalent Units [Member]  
Summarizes Transactions of SEUs
The following table summarizes the transactions of the Company’s SEUs for the three months ended March 31, 2020:
 
Number
of SEUs
 
  
Weighted
Average
Exercise
Price
 
  
Weighted
Average
Grant-
Date Fair
Value
 
Outstanding at December 31, 2019
   
390,816
     $
3.69
     $
59.91
  
Granted – at discount
   
103,607
     $
0.00
     $
77.33
  
– at market value
   
3,634
     $
95.70
     $
18.69
  
Exercised
   
(81,557
 )   $
0.94
     $
60.35
  
Forfeited
   
(9,536
 )   $
1.53
     $
58.85
  
                         
Outstanding at March 31, 2020
   
406,964
     $
4.17
     $
63.92