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Share-Based Compensation Restricted stock units and performance shares (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Years
Sep. 30, 2011
Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average vesting period of restricted stock units issued (in months) 9 months  
Number of restricted stock units issued (in shares) 70,824  
Weighted-average price of restricted stock units issued (in dollars per share) $ 15.46  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights Restricted stock unit grants typically vest in equal installments over a three-year period from the grant date.  
Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares granted under award plan (in shares) 136,846  
Performance period (in years) that the target number of performance shares for each executive officer is subject to adjustment based on the companys performance 3  
End date of performance share performance period 12/31/2014  
The date actual performance shares awarded will be distributed first quarter of 2015  
Grant date fair value of the award $ 25.42  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 1.4 $ 0.6