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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Taxes (Additional Textual) [Abstract]    
Income tax expense $ 198 $ 96
Effective tax rate 0.90% 1.00%
Minimum [Member] | Federal and Certain State Tax Jurisdictions [Member]
   
Income Taxes (Textual) [Abstract]    
Years subject to income tax examination 2009  
Maximum [Member] | Federal and Certain State Tax Jurisdictions [Member]
   
Income Taxes (Textual) [Abstract]    
Years subject to income tax examination 2013