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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015. 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)
2017

2016

2015
Vested stock grants
16,428


32,180


32,357

Stock-based compensation expense
$
0.5


$
0.7


$
0.7
Summary of the transactions pursuant to the stock option plans

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, 2017, and changes during the year ended December 31, 2017, 2016 and 2015, are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2014
555,700

 
$
19.57

Issued
12,589

 
23.65

Vested
(150,073
)
 
20.77

Forfeited
(16,500
)
 
19.45

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
Summary of compensation expense related to restricted stock units
The table below shows the Company's stock-based compensation expense related to the Performance-Based Incentive Program for the years ended December 31, 2017, 2016 and 2015, and is included in General and administrative expenses within the Consolidated Statements of Income.

Year Ended December 31,
(millions)
2017

2016

2015
Stock-based compensation
$
1.3


$
1.8


$
1.3

The table below shows the Company's stock-based compensation expense related to the restricted stock units for the years ended December 31, 2017, 2016 and 2015, and is included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions)
2017
 
2016
 
2015
Stock-based compensation expense
$
0.9

 
$
0.9

 
$
1.6
Summary of unrecognized compensation expense related to share based payment
The table below shows the Company's stock-based compensation expense related to the restricted stock units for the years ended December 31, 2017, 2016 and 2015, and is included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions)
2017
 
2016
 
2015
Stock-based compensation expense
$
0.9

 
$
0.9

 
$
1.6


Unrecognized stock-based compensation expense related to the restricted stock units for the years ended December 31, 2017, 2016 and 2015, is shown in the table below, along with the weighted average periods in which the expense will be recognized.

Year Ended December 31,
(millions)
2017

2016

2015
Unrecognized stock-based compensation
$
0.9


$
1.7


$
2.7

Weighted average (years)
2.1 years


2.8 years


3.8 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, 2017, and changes during the year ended December 31, 2017, 2016 and 2015 are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2014
79,430

 
$
18.96

Issued (1)
125,392

 
21.64

Vested
(6,915
)
 
19.91

Forfeited
(24,056
)
 
20.30

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 (2)
29,494

 
29.51

Vested
(61,919
)
 
22.63

Forfeited
(11,770
)
 
25.86

Nonvested as of December 31, 2017
115,282

 
$
28.01


(1) Includes an additional 19,855 shares of performance adjustments made at a weighted average grant-date fair value of $19.02.
(2) Includes a reduction of 59,091 shares of performance adjustments made at a weighted average grant-date fair value of $26.07.