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Stock Option Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Option Activity The table below summarizes the option activity for the three months ended  March 31, 2020:
 
 
Number of
Shares
 
Weighted
Average
Exercise Price
per share
 
Aggregate
Intrinsic Value
Outstanding at January 1
 
1,309,614

 
$
53.38

 
$
2,528,463

Granted
 
—

 
—

 
—

Exercised
 
(10,749
)
 
49.19

 
85,268

Expired/Forfeited
 
—

 
—

 
—

Outstanding at March 31
 
1,298,865

 
53.42

 
—

Exercisable at March 31
 
752,865

 
52.47

 
—