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Debt (Details) (USD $)	3 Months Ended	0 Months Ended
Debt (Details) (USD $)	Mar. 31, 2013 FFB	Apr. 23, 2013 Pollution control revenue bonds Subsequent events	Mar. 02, 2013 Pollution control revenue bonds Subsequent events
Debt
Debt issued	$ 20,734,000	$ 212,760,000
Refund of pollution control revenue bonds			$ 212,760,000
Interest rate (as a percent)		2.40%

The cash outflow from settlement of a long-term debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer.

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