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Income Taxes: Net Operating Loss and and Tax Credit Carryforwards (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Internal Revenue Service (IRS)  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards, With no Expiration Date $ 547,200,000
Tax Credit Carryforward 110,500,000
State and Local Jurisdiction  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards 242,600,000
Tax Credit Carryforward 8,400,000
State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards Valuation Allowance 300,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 0
Reductions in valuation allowance 700,000
State and Local Jurisdiction | Valuation Allowance, Income Tax Credit Carryforwards  
Operating Loss Carryforwards [Line Items]  
Income Tax Credit carryforward, valuation allowance 0
Reductions in valuation allowance $ 14,400,000