Summary Of Significant Accounting Policies (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Balance at beginning	$ 76,257	$ 76,257
Balance at ending	76,257	76,257
Ecova [Member]
Balance at beginning	71,011	71,011
Balance at ending	71,011	71,011
Other [Member]
Balance at beginning	12,979	12,979
Balance at ending	12,979	12,979
Accumulated Impairment Losses [Member]
Balance at beginning	(7,733)	(7,733)
Balance at ending	$ (7,733)	$ (7,733)