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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Activity
The following table presents restricted stock activity for the years 2018, 2017 and 2016:
 
2018
 
2017
 
2016
 
# 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
283,338

 
$
37.26

 
224,289

 
$
41.30

 
197,674

 
$
43.56

Granted
142,475

 
39.58

 
216,017

 
36.03

 
150,647

 
39.47

Forfeited
(12,858
)
 
40.06

 
(29,150
)
 
42.50

 
(51,234
)
 
43.56

Vested
(228,765
)
 
35.86

 
(127,818
)
 
41.06

 
(72,798
)
 
42.06

Nonvested restricted shares outstanding at December 31
184,190

 
$
40.33

 
283,338

 
$
37.26

 
224,289

 
$
41.30
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,
 
2018
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
94.5

 
$
34.5

 
$
82.8

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

 
(0.2
)
Undistributed and distributed earnings available to common stockholders
$
93.9

 
$
34.1

 
$
82.3

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Average number of common shares outstanding
30,551.3

 
30,407.1

 
30,310.9

Effect of dilutive stock-based compensation
141.6

 
142.2

 
152.5

Average number of common and potential common shares outstanding
30,692.9

 
30,549.3

 
30,463.4