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USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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