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Stock Compensation Plans (Common Stock Repurchased) (Details) (Ecova [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Ecova [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased from Ecova employees	$ 599	$ 464	$ 2,593

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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