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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity
The table below summarizes award activity.
 
Six Months Ended
 
June 30, 2014
 
June 30, 2013
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
1,477,762

 
$
5.83

 
1,463,272

 
$
5.97

Granted
467,567

 
7.52

 
627,488

 
5.73

Converted
(186,179
)
 
7.50

 
(392,748
)
 
4.87

Expired
(4,300
)
 
7.64

 
—

 
—

Forfeited
(17,800
)
 
6.26

 
(7,200
)
 
6.82

Outstanding at end of period
1,737,050

 
$
6.10

 
1,690,812

 
$
6.13

Vested
415,550

 
$
5.28

 
441,812

 
$
4.90