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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation expense
The following table summarizes share-based compensation expense:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(in thousands)
2015
 
2014
 
2015
 
2014
Restricted stock
$
523

 
$
653

 
$
1,623

 
$
2,066

Performance unit incentive plan (“PUP”)
456

 
(600
)
 
1,444

 
(505
)
Restricted stock units
46

 
6

 
64

 
1

Share-based compensation before income tax benefit
1,025

 
59

 
3,131

 
1,562

Income tax benefit
(381
)
 
(17
)
 
(1,180
)
 
(587
)
Share-based compensation, net of income tax benefit
$
644

 
$
42

 
$
1,951

 
$
975
Summary of liability based award activity
The following table summarizes the activity of the outstanding share-based compensation awards:
 
Restricted Stock
 
PUP Awards
 
Restricted Stock Units
 
Shares
 
Weighted-Average
Grant Date
Fair Value
 
Units
 
Weighted-Average
Grant Date
Fair Value
 
Units
 
Weighted-Average
Grant Date
Fair Value
Balance, December 31, 2014
328,602

 
$
23.30

 
267,120

 
$
23.51

 
25,370

 
$
23.17

Granted
82,000

 
$
27.36

 
91,100

 
$
27.31

 
4,800

 
$
27.35

Vested
(105,115
)
 
$
20.52

 
(103,555
)
 
$
20.60

 
(11,623
)
 
$
20.91

Forfeited
(27,765
)
 
$
24.19

 
(22,300
)
 
$
24.92

 
—

 
$
—

Balance, September 30, 2015
277,722

 
$
25.47

 
232,365

 
$
26.16

 
18,547

 
$
25.67
Summary of stock option activity
The following table summarizes stock option activity:
 
Shares
 
Weighted-
Average
Exercise Price
 
Options
Exercisable
Options outstanding at December 31, 2014
247,590

 
$
17.82

 
247,590

Exercised
(54,076
)
 
$
16.62

 
 
Forfeited or expired
(129,741
)
 
$
18.91

 
 
Options outstanding at September 30, 2015
63,773

 
$
16.62

 
63,773