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Summary of Significant Accounting Policies (Taxes on revenues) (Details) (Alabama Gas Corporation, Excise Taxes, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Alabama Gas Corporation \| Excise Taxes
Component of Operating Other Cost and Expense [Line Items]
Taxes on revenues	$ 21,479	$ 25,268	$ 30,704

The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services.

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