Discontinued Operations And Other Dispositions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended			1 Months Ended
	Feb. 10, 2012	Feb. 29, 2008	Dec. 31, 2011	Jul. 31, 2011 Maine [Member] customer	Dec. 31, 2011 Maine [Member]	May 01, 2012 New York [Member]	Jul. 31, 2011 New York [Member] customer	Jun. 30, 2012 New York [Member]	Sep. 30, 2011 New York [Member]	May 31, 2012 Florida [Member]	Jun. 30, 2011 North Carolina [Member]	May 31, 2011 Missouri [Member]	Jan. 31, 2011 Texas [Member]
Discontinued Operations And Other Dispositions [Line Items]
Proceeds from sale of regulated water operations					$ 36,870	$ 39,274
Liabilities assumed from sale of regulated water operations				17,364			23,000
Carrying amount of assets								504
Carrying amount of liabilities								4,860
Number of customers				16,000			51,000
Deferred tax liabilities					4,008				3,245
Gain (loss) on sale			17,699			(2,736)
Gain (loss) on sale, after tax			10,821			(1,874)
Percentage of utility system that has been relinquished	0.40%
Proceeds on sale of water and wastewater utility system										2,505	4,106	3,225	3,118
Gain on sale of water and wastewater utility system										328	2,692	280	2,452
Percentage of utility system that assets represent										0.05%			0.11%
Initial valuation payment		$ 16,911