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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Taxes (Textual) [Abstract]        
Income taxes $ 4,747 $ 1,520 $ 9,160 $ 1,983
Estimated effective tax rates 40.00% 40.00% 39.00% 39.00%