Summary Of Significant Accounting Policies (Other Income - Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Interest income	$ 653	$ 987	$ 754
Interest on regulatory deferrals	48	220	126
Equity-related AFUDC	8,331	8,808	6,066
Net gain (loss) on investments	(637)	276	(3,378)
Other income	905	1,055	1,599
Other income-net	$ 9,300	$ 11,346	$ 5,167