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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
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 
 June 30,
 
Six Months Ended 
 June 30,
(in thousands)
2014
 
2013
 
2014
 
2013
Restricted stock
$
759

 
$
947

 
$
1,413

 
$
1,720

Performance unit incentive plan (“PUP”)
326

 
(339
)
 
95

 
524

Restricted stock units
27

 
(66
)
 
(5
)
 
101

Stock options
—

 
6

 
—

 
22

Share-based compensation before income tax benefit
1,112

 
548

 
1,503

 
2,367

Income tax benefit
(417
)
 
(230
)
 
(569
)
 
(903
)
Share-based compensation, net of income tax benefit
$
695

 
$
318

 
$
934

 
$
1,464
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, 2013
430,899

 
$
22.78

 
299,768

 
$
23.46

 
28,560

 
$
22.91

Granted
83,300

 
23.95

 
123,300

 
23.71

 
6,700

 
24.95

Vested
(133,637
)
 
22.67

 
(94,600
)
 
23.01

 
(9,890
)
 
23.45

Forfeited
(14,540
)
 
21.87

 
(2,700
)
 
27.35

 
(500
)
 
27.32

Balance, June 30, 2014
366,022

 
23.13

 
325,768

 
23.65

 
24,870

 
23.16
Summary of stock option activity
The following table summarizes stock option activity:
 
Shares
 
Weighted-
Average
Exercise Price
 
Options
Exercisable
Options outstanding at December 31, 2013
314,323

 
$
19.79

 
314,323

Exercised
(66,076
)
 
18.53

 
 
Forfeited or expired
(18,522
)
 
35.28

 
 
Award modification
17,865

 
N/A

 
 
Options outstanding at June 30, 2014
247,590

 
$
17.82

 
247,590