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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Activity The following table presents restricted stock activity for the years 2019, 2018 and 2017:
 
2019
 
2018
 
2017
 
# of Shares
 
Weighted Average Fair Value at Date of Grant
 
# of Shares
 
Weighted Average Fair Value at Date of Grant
 
# of Shares
 
Weighted Average Fair Value at Date of Grant
Nonvested restricted shares outstanding at January 1
184,190

 
$
40.33

 
283,338

 
$
37.26

 
224,289

 
$
41.30

Granted
155,982

 
35.62

 
142,475

 
39.58

 
216,017

 
36.03

Forfeited
(8,869
)
 
41.34

 
(12,858
)
 
40.06

 
(29,150
)
 
42.50

Vested
(109,681
)
 
40.12

 
(228,765
)
 
35.86

 
(127,818
)
 
41.06

Nonvested restricted shares outstanding at December 31
221,622

 
$
37.08

 
184,190

 
$
40.33

 
283,338

 
$
37.26
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
 
For the Years Ended December 31,
 
2019
 
2018
 
2017
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
85.8

 
$
94.5

 
$
34.5

Less: Dividends paid to participating securities
(0.4
)
 
(0.3
)
 
(0.4
)
Less: Undistributed earnings available to participating securities
(0.2
)
 
(0.3
)
 
—

Undistributed and distributed earnings available to common stockholders
$
85.2

 
$
93.9

 
$
34.1

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Average number of common shares outstanding
30,652.2

 
30,551.3

 
30,407.1

Effect of dilutive stock-based compensation
186.1

 
141.6

 
142.2

Average number of common and potential common shares outstanding
30,838.3

 
30,692.9

 
30,549.3