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Compensation Plans: Stock Based (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) shares $ / shares | Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2022 USD ($) shares $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant | 1,900,000 |  |
Impact outright issuance of one share has on number of available shares | 1 |  |
Performance Shares (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum impact of issuance of one performance share award on available shares under the equity incentive plan | 2 |  |
Multiplier applied to PSU awards at settlement |  |  | 2.0
Award vesting period | 3 years |  |
Stock-based compensation expense | $ | $ 5.5 | $ 2.8 | $ 2.6
Unrecognized stock based compensation expense | $ | 13.9 |  |
Fair value of PSUs/RSUs granted in period | $ | $ 9.9 | $ 7.7 | $ 7.4
Non-vested at beginning of year (in shares) | 469,432 | 273,258 | 464,483
Non-vested outstanding at beginning of year grant date fair value ($/share) | $ / shares | $ 27.83 | $ 26.67 | $ 12.80
Granted (in shares) | 231,120 | 256,633 | 276,010
Granted grant date fair value ($/share) | $ / shares | $ 42.76 | $ 29.93 | $ 26.67
Vested (in shares) | 0 | (15,950) | (461,387)
Vested grant date fair value ($/share) | $ / shares | $ 0 | $ 25.50 | $ 12.81
Forfeited (in shares) | (6,186) | (44,509) | (5,848)
Forfeited grant date fair value ($/share) | $ / shares | $ 25.87 | $ 26.45 | $ 18.24
Non-vested at end of year (in shares) | 694,366 | 469,432 | 273,258
Non-vested outstanding at end of year grant date fair value ($/share) | $ / shares | $ 32.99 | $ 27.83 | $ 26.67
Multiplier assumed | 1 | 1 | 1
Shares held for settlement of income and payroll tax obligations (in shares) |  |  | 349,487
Shares Issued in Period | 0 | 0 | 654,923
Fair value of PSUs/RSUs Vested in Period | $ |  |  | $ 12.3
Performance Shares (PSUs) | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Multiplier applied to PSU awards at settlement | 0 |  |
Performance Shares (PSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Multiplier applied to PSU awards at settlement | 2 |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ | $ 16.7 | $ 14.8 | 13.5
Unrecognized stock based compensation expense | $ | 29.7 |  |
Fair value of PSUs/RSUs granted in period | $ | $ 21.9 | $ 20.2 | $ 18.0
Non-vested at beginning of year (in shares) | 1,080,544 | 1,375,052 | 1,841,237
Non-vested outstanding at beginning of year grant date fair value ($/share) | $ / shares | $ 31.49 | $ 22.42 | $ 13.79
Granted (in shares) | 504,010 | 630,474 | 526,776
Granted grant date fair value ($/share) | $ / shares | $ 43.44 | $ 32.03 | $ 34.08
Vested (in shares) | (507,171) | (805,205) | (920,927)
Vested grant date fair value ($/share) | $ / shares | $ 30.18 | $ 16.75 | $ 12.17
Forfeited (in shares) | (37,546) | (119,777) | (72,034)
Forfeited grant date fair value ($/share) | $ / shares | $ 32.96 | $ 29.26 | $ 18.24
Non-vested at end of year (in shares) | 1,039,837 | 1,080,544 | 1,375,052
Non-vested outstanding at end of year grant date fair value ($/share) | $ / shares | $ 37.87 | $ 31.49 | $ 22.42
Restricted stock units, shares settled gross of shares for tax withholdings | 508,927 | 803,449 | 920,927
Shares held for settlement of income and payroll tax obligations (in shares) | 158,252 | 249,233 | 284,423
Shares Issued in Period | 350,675 | 554,216 | 636,504
Number of Shares Represented by Each RSU | 1 |  |
Fair value of PSUs/RSUs Vested in Period | $ | $ 15.3 | $ 13.5 | $ 11.2
Retirement vesting Increment | 6 months |  |
Retirement increment vesting period | 6 months |  |

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