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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2019
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 nine months ended September 30, 2019:
                         
 
Number of
Options
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Grant-Date
Fair Value
 
Outstanding at December 31, 2018
   
545,249
    $
32.46
    $
36.06
 
Granted - at discount
   
67,230
    $
0.00
    $
71.54
 
      - at market value
   
12,539
    $
81.07
    $
22.69
 
Exercised
   
(89,119
)   $
13.23
    $
29.30
 
Forfeited
   
(11,845
)   $
41.62
    $
36.25
 
                         
Outstanding at September 30, 2019
   
524,054
    $
32.52
    $
41.44
 
                         
 
 
 
Stock Equivalent Units [Member]  
Summarizes Transactions of SEUs
The following table summarizes the transactions of the Company’s SEUs for the nine months ended September 30, 2019:
                         
 
Number
of SEUs
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Grant-Date
Fair Value
 
Outstanding at December 31, 2018
   
418,936
    $
3.47
    $
52.45
 
Granted - at discount
   
123,815
    $
0.00
    $
71.47
 
      - at market value
   
4,359
    $
81.07
    $
22.69
 
Exercised
   
(131,496
)   $
2.40
    $
46.75
 
Forfeited
   
(7,750
)   $
2.24
    $
58.08
 
                         
Outstanding at September 30, 2019
   
407,864
    $
3.61
    $
59.64