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Commitments, Legal Proceedings and Contingencies, and Guarantees:Guarantees (Details) - 4.875% Senior Notes Due 2030 [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Jul. 27, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000 |  | $ 0
Senior Notes [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Long-term Debt, Gross |  | $ 400,000 |
Interest rate |  | 4.875% |

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