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12/31/2010
USD ($)
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3/31/2011
USD ($)
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12/31/2010
USD ($)
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3/31/2011
USD ($)
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12/31/2010
USD ($)
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{us-gaap_DerivativesFairValueByBalanceSheetLocationAxis} : Other Assets Noncurrent [Member]
3/31/2011
USD ($)
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12/31/2010
USD ($)
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{us-gaap_DerivativesFairValueByBalanceSheetLocationAxis} : Other Liabilities Current [Member]
3/31/2011
USD ($)
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12/31/2010
USD ($)
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