Summary Of Significant Accounting Policies (Other Income - Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Interest income	$ 118	$ 154	$ 478	$ 678
Interest on regulatory deferrals	10	59	44	154
Equity-related AFUDC	2,017	2,189	5,891	6,426
Net loss on investments	240	(27)	(211)	118
Other income	(262)	233	(12)	887
Total	$ 2,123	$ 2,608	$ 6,190	$ 8,263