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Financing: Schedule of Short-term Debt and Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Short-term Debt [Line Items] |  |
Notes payable | $ 335,050 | $ 420,180
Letters of Credit | 14,239 | 27,209
Commercial Paper |  |
Short-term Debt [Line Items] |  |
Notes payable | 335,050 | 420,180
Letters of Credit | 0 | 0
Revolving Credit Facility |  |
Short-term Debt [Line Items] |  |
Notes payable | 0 | 0
Letters of Credit | $ 14,239 | $ 27,209

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