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USD ($)
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USD ($)
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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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{us-gaap_PublicUtilityAxis} : Other Plant in Service [Member]
12/31/2010
USD ($)
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{us-gaap_PublicUtilityAxis} : Other Plant in Service [Member]
12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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{us-gaap_PublicUtilityAxis} : Other Plant in Service [Member]
12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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