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Compensation Plans: Stock Based (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) shares | Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares available for grant | shares | 4,900,000 | 4,900,000 |
Performance Shares (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Award Vesting Period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed, TSR Cap | shares |  | 1 |
Stock-based compensation expense |  | $ 0.7 | $ 3.2
Unrecognized stock based compensation expense | $ 0.7 | $ 0.7 |
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 |  |  |
Stock-based compensation expense |  | $ 3.3 | $ 2.2
Unrecognized stock based compensation expense | $ 17.2 | $ 17.2 |
Number of shares represented by each RSU | shares | 1 | 1 |

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