Summary Of Significant Accounting Policies (Other Expense (Income) - Net) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]
Interest income	$ (1,327)	$ (1,159)	$ (1,614)
Interest on regulatory deferrals	(89)	(248)	(2,935)
Equity-related AFUDC	(2,225)	(3,353)	(3,078)
Net loss on investments	488	3,297	837
Dues and donations	2,143	4,164	1,405
Other expense	5,213	5,686	5,472
Other income	(18)	(430)	(889)
Total	$ 4,185	$ 7,957	$ (802)