Discontinued Operations And Other Dispositions (Schedule Of Disposal Groups Including Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Discontinued Operations And Other Dispositions [Abstract]
Property, plant and equipment, at cost		$ 169,527
Less: accumulated depreciation		56,711
Net property, plant and equipment		112,816
Current assets	504	10,423
Regulatory assets		34,396
Goodwill		12,316
Other assets		2,287
Assets of discontinued operations held for sale	504	172,238
Long-term debt, excluding current portion		40,326
Current liabilities	4,142	7,088
Deferred income taxes and investment tax credits		23,570
Contributions in aid of construction		9,967
Other liabilities	718	33,928
Liabilities of discontinued operations held for sale	4,860	114,879
Net assets	$ (4,356)	$ 57,359

The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for current assets (assets with expected useful life shorter than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.