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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
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.
 
Nine Months Ended
 
September 30, 2015
 
September 30, 2014
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
1,406,550

 
$
6.21

 
1,477,762

 
$
5.83

Granted
390,200

 
9.61

 
467,567

 
7.52

Converted
(263,791
)
 
6.42

 
(186,179
)
 
7.50

Expired
(1,600
)
 
10.11

 
(4,300
)
 
7.64

Forfeited
(13,800
)
 
7.36

 
(17,800
)
 
6.26

Outstanding at end of period
1,517,559

 
$
7.03

 
1,737,050

 
$
6.10

Vested
329,059

 
$
5.61

 
415,550

 
$
5.28