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Income Taxes (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Income Taxes |  |  |  |
Current tax expense | $ 87 | $ 76 | $ 158 | $ 154

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