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Business Description And Significant Accounting Policies: Recently Adopted Accounting Standards (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 2,662,647   $ 2,464,069 $ 2,287,423 $ 1,820,206
Cumulative Effect, Period of Adoption, Adjustment          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (207) $ 200 $ 3,390