Discontinued Operations (Schedule Of Disposal Groups Including Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Discontinued Operations [Abstract]
Property, plant and equipment, at cost	$ 37,226	$ 37,303
Less: accumulated depreciation	8,197	8,378
Net property, plant and equipment	29,029	28,925
Current assets	976	1,362
Regulatory assets	423	460
Assets of discontinued operations held for sale	30,428	30,747
Current liabilities	14,583	16,212
Deferred income taxes and investment tax credits	1,819	1,308
Contributions in aid of construction	11,048	10,935
Other liabilities	1,219	1,194
Liabilities of discontinued operations held for sale	28,669	29,649
Net assets	$ 1,759	$ 1,098