Income Taxes: Net Operating Loss and and Tax Credit Carryforwards (Details) |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
USD ($)
| |
| Internal Revenue Service (IRS) | |
| Operating Loss Carryforwards [Line Items] | |
| Operating Loss Carryforwards, With no Expiration Date | $ 380,100,000 |
| Tax Credit Carryforward | 104,100,000 |
| State and Local Jurisdiction | |
| Operating Loss Carryforwards [Line Items] | |
| Operating Loss Carryforwards | 142,300,000 |
| Tax Credit Carryforward | 8,100,000 |
| State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards | |
| Operating Loss Carryforwards [Line Items] | |
| Operating Loss Carryforwards Valuation Allowance | 0 |
| 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 | $ 0 |