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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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.
 
Three Month Ended
 
March 31, 2014
 
March 31, 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
(68,950
)
 
11.17

 
(296,400
)
 
4.80

Expired
—

 
—

 
—

 
—

Forfeited
(2,600
)
 
5.79

 
(2,200
)
 
5.99

Outstanding at end of period
1,873,779

 
$
6.06

 
1,792,160

 
$
6.08

Vested
517,379

 
$
5.27

 
533,560

 
$
4.91