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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, 2022
Dec. 31, 2021
Jul. 27, 2020
Guarantor Obligations [Line Items]      
Long-term Debt, Gross $ 400,000 $ 400,000  
Senior Notes [Member]      
Guarantor Obligations [Line Items]      
Long-term Debt, Gross     $ 400,000
Interest rate     4.875%