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Employee Benefit Plans: Change in Accounting Principal (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Other income (expense), net $ (2,293) $ (5,740) $ (1,180)
Income tax benefit (expense) (32,918) (29,580) 23,667
Net income available for common stock 227,608 $ 199,310 $ 258,442
Cumulative Effect, Period of Adoption, Adjustment      
Defined Benefit Plan Disclosure [Line Items]      
Other income (expense), net 600    
Income tax benefit (expense) 200    
Net income available for common stock $ 400