Water And Wastewater Rates (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Water And Wastewater Rates [Line Items]
Authorized increase in revenue	$ 6,087	$ 6,087
Infrastructure rehabilitation surcharges		13,150
Infrastructure rehabilitation surcharge percentage, reset level upon new base rates		0.00%
Additional operating revenue recognized after removal of revenue reserve	3,098
Refunded revenue recognition		$ 6,195
Maximum [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges capped percentage		9.00%
Minimum [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges capped percentage		5.00%