Discontinued Operations And Other Dispositions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended	1 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended
	Jun. 30, 2011	Dec. 31, 2008	Jul. 31, 2011 Maine [Member]	Sep. 30, 2011 Maine [Member]	Jun. 30, 2011 Maine [Member]	Jul. 31, 2011 New York [Member]	Sep. 30, 2011 New York [Member]	May 31, 2011 Missouri [Member]	Mar. 31, 2011 Texas [Member]
Discontinued Operations And Other Dispositions [Line Items]
Proceeds from sale of regulated water operations	$ 4,106		$ 35,800			$ 42,000		$ 3,225	$ 3,118
Liabilities assumed from sale of regulated water operations			17,500			23,000
Carrying amount of assets					60,844		108,883
Carrying amount of liabilities					48,202		66,619
Number of customers					16,000		51,000
Deferred tax liabilities				4,501			2,937
Gain on sale of water and wastewater utility system	1,580								2,452
Initial valuation payment		16,911
Percentage of utility system that has been relinquished		0.40%
Estimated loss on discontinued operations							$ 1,254