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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation arrangements, vested stock grants
The following is a summary of Company authorized vested stock grants to certain directors for the year ended December 31, 2018, 2017 and 2016. Stock-based compensation expense related to vested stock grants are included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions, except stock grants)
2018

2017

2016
Vested stock grants
12,736


16,428


32,180

Stock-based compensation expense
$
0.5


$
0.5


$
0.7
Summary of the status of the restricted stock units and changes during the period
A summary of the status of the restricted stock units as of December 31, 2018, and changes during the year ended December 31, 2018, 2017 and 2016, are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2015
401,716

 
$
19.25

Issued
4,020

 
24.87

Vested
(54,215
)
 
18.33

Forfeited
(17,324
)
 
19.68

Nonvested as of December 31, 2016
334,197

 
$
19.45

Issued
22,000

 
18.25

Vested
(26,399
)
 
18.98

Forfeited
(4,537
)
 
21.92

Nonvested as of December 31, 2017
325,261

 
$
19.37

Issued
57,089

 
35.28

Vested
(173,240
)
 
19.67

Forfeited
(6,456
)
 
21.57

Nonvested as of December 31, 2018
202,654

 
$
23.53
Summary of compensation expense related to restricted stock units
The table below shows the Company's stock-based compensation expense related to the restricted stock units for the years ended December 31, 2018, 2017 and 2016, and is included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions)
2018
 
2017
 
2016
Stock-based compensation expense
$
0.9

 
$
0.9

 
$
0.9

The table below shows the Company's stock-based compensation expense related to the Performance-Based Incentive Program for the years ended December 31, 2018, 2017 and 2016, and is included in General and administrative expenses within the Consolidated Statements of Income.

Year Ended December 31,
(millions)
2018

2017

2016
Stock-based compensation
$
1.4


$
1.3


$
1.8
Summary of unrecognized compensation expense related to share based payment
Unrecognized stock-based compensation expense related to the restricted stock units and the respective weighted average periods in which the expense will be recognized for the years ended December 31, 2018, 2017 and 2016, is shown in the table below.

Year Ended December 31,
(millions)
2018

2017

2016
Unrecognized stock-based compensation
$
1.8


$
0.9


$
1.7

Weighted average (years)
2.3 years


2.1 years


2.8 years
Summary of the status of the performance stock units and changes during the period
A summary of the status of the performance share units as of December 31, 2018, and changes during the year ended December 31, 2018, 2017 and 2016 are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2015
173,851

 
$
20.63

Issued
99,466

 
23.72

Vested
(84,417
)
 
19.15

Forfeited
(29,423
)
 
22.52

Nonvested as of December 31, 2016
159,477

 
22.99

Issued (1)
29,494

 
29.51

Vested
(61,919
)
 
22.63

Forfeited
(11,770
)
 
25.86

Nonvested as of December 31, 2017
115,282

 
28.01

Issued (2)
55,640

 
36.49

Vested
(66,657
)
 
25.42

Forfeited
(10,572
)
 
29.70

Nonvested as of December 31, 2018
93,693

 
$
35.92


(1) Includes a reduction of 59,091 shares of performance adjustments made at a weighted average grant-date fair value of $26.07.
(2) Includes a reduction of 45,075 shares of performance adjustments made at a weighted average grant-date fair value of $35.86.