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Financing: Schedule of Short-term Debt and Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Notes payable	$ 332,525	$ 234,040
Letters of Credit	23,255	24,730
Commercial Paper
Short-term Debt [Line Items]
Notes payable	332,525	234,040
Letters of Credit	0	0
Revolving Credit Facility
Short-term Debt [Line Items]
Notes payable	0	0
Letters of Credit	$ 23,255	$ 24,730

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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Balance Type:	credit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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