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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of activity of stock options and awards of shares and stock units
The following table summarizes activity regarding our stock options and awards of shares and stock units since December 31, 2016:
Stock Options
 
Restricted Stock Units
 
 
Shares
 
Weighted
Average
Price
 
 
 
Shares
 
Weighted
Average
Price
Balance, December 31, 2016
 
143,000

 
$
23.06

 
Balance, December 31, 2016
 
492,288

 
$
44.93

Granted
 
—

 
—

 
Granted
 
198,179

 
$
68.33

Expired
 
—

 
—

 
Forfeited
 
(1,200
)
 
$
60.68

Exercised
 
(50,000
)
 
$
20.42

 
Vested
 
(180,395
)
 
$
44.57

Balance, December 31, 2017
 
93,000

 
$
24.48

 
Balance, December 31, 2017
 
508,872

 
$
54.13

Granted
 
—

 
—

 
Granted
 
135,259

 
$
80.37

Expired
 
—

 
—

 
Forfeited
 
(1,250
)
 
$
71.27

Exercised
 
(53,000
)
 
$
24.48

 
Vested
 
(166,295
)
 
$
48.44

Balance, December 31, 2018
 
40,000

 
$
24.48

 
Balance, December 31, 2018
 
476,586

 
$
63.52

Granted
 
—

 
—

 
Granted
 
169,766

 
$
64.34

Expired
 
—

 
—

 
Forfeited
 
(2,545
)
 
$
71.88

Exercised
 
(20,000
)
 
$
24.48

 
Vested
 
(226,229
)
 
$
51.64

Balance, December 31, 2019
 
20,000

 
$
24.48

 
Balance, December 31, 2019
 
417,578

 
$
70.24
Summary of information about stock options
The following table summarizes information about our outstanding stock options as of December 31, 2019:  
Stock Options Outstanding and Exercisable
Range of
Exercise Prices
 
Number
 
Weighted Average
Remaining Life
 
Weighted Average
Exercise Price
$24.48
 
20,000
 
0.45 Years
 
$24.48