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Notes Payable, Current Maturities and Debt: Schedule of Short-term Debt and Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Short-term Debt [Line Items] |  |  |
Notes payable | $ 84,320 |  | $ 349,500
Letters of Credit | 24,588 |  | 30,274
Net (payments) borrowings of short-term debt | (265,180) | $ 109,280 |
Commercial Paper |  |  |
Short-term Debt [Line Items] |  |  |
Notes payable | 84,320 |  | 349,500
Letters of Credit | 0 |  | 0
Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Notes payable | 0 |  | 0
Letters of Credit | 24,588 |  | $ 30,274
Line of Credit Facility, Current Borrowing Capacity | $ 750,000 |  |

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