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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Taxes (Textual) [Abstract]        
Effective tax rate 3.90% 12.00% (1.40%) 12.00%
Federal statutory tax rate 34.00% 34.00% 34.00% 34.00%