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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
(in thousands)
2015
 
2014
Restricted stock
$
594

 
$
654

Performance unit incentive plan (“PUP”)
612

 
(231
)
Restricted stock units
25

 
(32
)
Share-based compensation before income tax benefit
1,231

 
391

Income tax benefit
(462
)
 
(152
)
Share-based compensation, net of income tax benefit
$
769

 
$
239
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
73,000

 
$
27.36

 
82,300

 
$
27.35

 
4,800

 
$
27.35

Vested
(100,970
)
 
$
20.61

 
(103,555
)
 
$
20.60

 
(11,123
)
 
$
20.61

Forfeited
(8,700
)
 
$
23.12

 
(14,200
)
 
$
23.67

 
—

 
$
—

Balance, March 31, 2015
291,932

 
$
25.26

 
231,665

 
$
26.17

 
19,047

 
$
25.72
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
(13,525
)
 
$
16.62

 
 
Forfeited or expired
(129,741
)
 
$
18.91

 
 
Options outstanding at March 31, 2015
104,324

 
$
17.62

 
104,324