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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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1/1/2008 - 12/31/2008
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - customers [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - customers [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - customers [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Section 09
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 -Number 210
 -Section 09
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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 -Article 12

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 -Section 09
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2008 - 12/31/2008
USD ($)
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/><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Consolidated Valuation and Qualifying Accounts</Label></Row><Row><Id>58</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>us-gaap_ValuationAllowancesAndReservesBalance</ElementName><ElementPrefix>us-gaap</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>credit</BalanceType><PeriodType>instant</PeriodType><ShortDefinition>No definition 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/><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>2</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>6815000</NumericAmount><RoundedNumericAmount>6815</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>3</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>9000</NumericAmount><RoundedNumericAmount>9</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Number 210
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 -Number 210
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 -Name Regulation S-X (SX)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2008 - 12/31/2008
USD ($)
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/><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Number 210
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Accumulated provision for uncollectible accounts - other [Member]
1/1/2008 - 12/31/2008
USD ($)
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/><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Number 210
 -Section 09
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Number 210
 -Section 09
 -Article 12

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 -Section 09
 -Article 12

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 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 09
 -Article 12

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 -Number 210
 -Section 09
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