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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Share-based Compensation [Abstract]  
Summary of company stock award
A summary of the status of the Company’s stock awards as of March 31, 2013, and changes during the three months ended March 31, 2013, is presented below: 
 
Shares
 
Weighted
 Average
Grant-Date
Fair Value
Nonvested at January 1, 2013
346,860

 
$
17.06

Granted
207,550

 
$
21.88

Vested
(92,280
)
 
$
17.32

Forfeited
(2,720
)
 
$
17.41

Nonvested at March 31, 2013
459,410

 
$
19.18