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Stock Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 0.4 $ 0.7
Options Granted (in shares) 323,400  
The total intrinsic value of all stock options exercised 0.6 0.1
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, in years 3 years  
Option expiration period 10 years  
Total unrecognized compensation cost related to non-vested share based compensation arrangements $ 5.2  
Recognition period for unrecognized stock compensation 3 years  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 169,100  
Granted, Average Grant Date Fair Value (in dollars per share) $ 14.77  
2008 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized for grant under plan (in shares) 3,000,000