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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes        
Effective tax rates 3.90% 106.30% (4.70%) 58.20%
U.S. statutory rate 35.00%