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Income Taxes: Net Operating Loss and and Tax Credit Carryforwards (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 111,000,000
Operating Loss Carryforwards, With no Expiration Date	587,300,000
Tax Credit Carryforward	110,100,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	325,300,000
Tax Credit Carryforward	22,800,000
State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Valuation Allowance	1,000,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	0
State and Local Jurisdiction | Valuation Allowance, Income Tax Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Income Tax Credit carryforward, valuation allowance	$ 14,400,000

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Operating Loss Carryforwards, With no Expiration Date

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