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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%