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Commitments, Legal Proceedings and Contingencies, and Guarantees:Guarantees (Details) - 5.625% Senior Notes Due 2024 [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Aug. 29, 2016
Guarantor Obligations [Line Items]      
Interest rate 5.625%   5.625%
Long-term Debt, Gross $ 350,000 $ 350,000