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Compensation Plans: Stock Based (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 07, 2024 USD ($) shares | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares available for grant | shares |  | 2,800,000 |  | 2,800,000 |
Performance Shares (PSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award Vesting Period |  |  |  | 3 years |
Stock-based compensation expense | $ |  | $ 1.4 | $ 0.2 | $ 2.4 | $ 0.8
Unrecognized stock based compensation expense | $ |  | $ 7.1 |  | $ 7.1 |
Performance Shares (PSUs) | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Multiplier applied to PSU awards at settlement |  | 0 |  | 0 |
Performance Shares (PSUs) | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Multiplier applied to PSU awards at settlement |  | 2 |  | 2 |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of shares represented by each RSU | shares |  | 1 |  | 1 |
Stock-based compensation expense | $ |  | $ 3.8 | $ 3.4 | $ 7.5 | $ 6.7
Unrecognized stock based compensation expense | $ |  | $ 17.3 |  | $ 17.3 |
Restricted Stock Units (RSUs) | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $ | $ 20.1 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 461,411 |  |  |  |
Shares Withheld for Tax Withholding Obligation | shares | 157,643 |  |  |  |
Shares Issued in Period | shares | 349,528 |  |  |  |

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