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Income Taxes (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Income Taxes |  |  |  |
Current tax expense | $ 207 | $ 69 | $ 365 | $ 223

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