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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Disclosure [Abstract]          
Income Tax Expense (Benefit) $ 41 $ 57 $ 420 $ 231  
Effective tax rate     16.80%   13.00%