Summary Of Significant Accounting Policies (Other Income - Net) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Accounting Policies [Abstract]
Interest income	$ (944)		$ (1,327)		$ (1,159)
Interest on regulatory deferrals	(68)		(89)		(248)
Equity-related AFUDC	(4,055)		(2,225)		(3,353)
Net loss on investments	3,343		488		3,297
Other income	(3,301)		(280)		(1,034)
Total	$ (5,025)	[1]	$ (3,433)	[1]	$ (2,497)	[1]

[1] Includes an immaterial correction of an error related to the reclassification of certain operating expenses from other expense-net to utility and non-utility other operating expenses and utility taxes other than income taxes. This correction did not have an impact on net income or earnings per share. See further discussion of this reclassification below under "Immaterial Correction of an Error".