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Selected Balance Sheet Information: Materials and Supplies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Selected Balance Sheet Information [Abstract]
Materials and supplies	$ 85,612	$ 85,250
Fuel - Electric Utilities	1,240	1,531
Natural gas in storage	58,891	30,619
Total materials, supplies and fuel	$ 145,743	$ 117,400

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Selected Balance Sheet Information [Abstract]

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No definition available.

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Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.

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Amount of fossil fuel included in inventory classified as other.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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