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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
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 Months Ended
 
March 31, 2013
 
March 31, 2012
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
1,463,272

 
$
5.97

 
1,458,037

 
$
5.77

Granted
627,488

 
5.73

 
601,647

 
5.93

Converted
(296,400
)
 
4.80

 
—

 
—

Expired
—

 
—

 
—

 
—

Forfeited
(2,200
)
 
5.99

 
(7,000
)
 
6.49

Outstanding at end of period
1,792,160

 
$
6.08

 
2,052,684

 
$
5.82

Vested
533,560

 
$
4.91

 
390,037

 
$
4.45