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Equity-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation [Abstract]  
Details of Compensation Expense
The following table details compensation expense and the related income tax benefit:
 
Quarter Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
 
(Dollars in thousands)
2015
 
2014
 
2015
 
2014
Employee equity-based compensation expense:
 
 
 
 
 
 
 
Performance shares
$
950

 
$
961

 
$
1,822

 
$
1,695

Restricted stock units
232

 
163

 
437

 
337

Total employee equity-based compensation expense
$
1,182

 
$
1,124

 
$
2,259

 
$
2,032

 
 
 
 
 
 
 
 
Deferred compensation stock equivalent units expense (income)
$
47

 
$
427

 
$
166

 
$
(14
)
 
 
 
 
 
 
 
 
Total tax benefit recognized for share-based expense
$
78

 
$
81

 
$
152

 
$
155
Fair Value of Performance Share Awards
The following table presents the key inputs used in the Monte Carlo simulation method to calculate the fair value of the performance share awards in 2015 and 2014, and the resulting fair values:
 
Six Months Ended 
 June 30,
 
 
2015
 
2014
Shares granted
78,974

 
87,441

Stock price as of valuation date
$
40.00

 
$
39.76

Risk-free rate
1.07
%
 
0.72
%
Fair value of a performance share
$
36.71

 
$
45.57
Summary of Outstanding Performance Share Awards
The following table summarizes outstanding performance share awards as of June 30, 2015, and changes during the six months ended June 30, 2015:
(Dollars in thousands, except grant date fair value)
Shares
 
Weighted-Avg.
Grant Date
Fair Value
 
Aggregate
Intrinsic Value
Unvested shares outstanding at January 1
160,233

 
$
53.86

 
 
Granted
78,974

 
$
36.71

 
 
Unvested shares outstanding at June 30
239,207

 
$
48.20

 
$
8,112
Summary of Outstanding RSU Awards
The following table summarizes outstanding RSU awards as of June 30, 2015, and changes during the six months ended June 30, 2015:
(Dollars in thousands, except grant date fair value)
Shares
 
Weighted-Avg.
Grant Date
Fair Value
 
Aggregate
Intrinsic Value
Unvested shares outstanding at January 1
32,455

 
$
42.24

 
 
Granted
27,820

 
$
39.99

 
 
Vested
(2,400
)
 
$
45.79

 
 
Unvested shares outstanding at June 30
57,875

 
$
41.01

 
$
2,044