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Compensation Plans: Stock Based (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2022 USD ($) shares $ / shares | Dec. 31, 2021 USD ($) shares $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant | 2,800,000 |  |
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 | 1.0
Stock-based compensation expense | $ | $ 2.8 | $ 2.6 | $ 6.0
Unrecognized stock based compensation expense | $ | 8.6 |  |
Fair value of PSUs/RSUs granted in period | $ | $ 7.7 | $ 7.4 |
Award vesting period | 3 years |  |
Non-vested at beginning of year (in shares) | 273,258 | 464,483 | 830,464
Non-vested outstanding at beginning of year grant date fair value ($/share) | $ / shares | $ 26.67 | $ 12.80 | $ 17.52
Granted (in shares) | 256,633 | 276,010 | 0
Granted grant date fair value ($/share) | $ / shares | $ 29.93 | $ 26.67 | $ 0
Vested (in shares) | (15,950) | (461,387) | (352,395)
Vested grant date fair value ($/share) | $ / shares | $ 25.50 | $ 12.81 | $ 23.81
Forfeited (in shares) | (44,509) | (5,848) | (13,586)
Forfeited grant date fair value ($/share) | $ / shares | $ 26.45 | $ 18.24 | $ 15.46
Non-vested at end of year (in shares) | 469,432 | 273,258 | 464,483
Non-vested outstanding at end of year grant date fair value ($/share) | $ / shares | $ 27.83 | $ 26.67 | $ 12.80
Performance share units, shares settled gross of shares for tax withholdings |  | 1,004,410 | 347,742
Shares held for settlement of income and payroll tax obligations (in shares) |  | (349,487) | (112,919)
Shares Issued in Period | 0 | 654,923 | 234,823
Fair value of PSUs/RSUs Vested in Period | $ |  | $ 12.3 | $ 8.4
Multiplier assumed | 1 | 1 | 1
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] |  |  |
Retirement vesting Increment | 6 months |  |
Retirement increment vesting period | 6 months |  |
Stock-based compensation expense | $ | $ 14.8 | $ 13.5 | $ 10.2
Unrecognized stock based compensation expense | $ | 25.7 |  |
Fair value of PSUs/RSUs granted in period | $ | $ 20.2 | $ 18.0 | $ 17.0
Non-vested at beginning of year (in shares) | 1,375,052 | 1,841,237 | 2,097,860
Non-vested outstanding at beginning of year grant date fair value ($/share) | $ / shares | $ 22.42 | $ 13.79 | $ 8.83
Granted (in shares) | 630,474 | 526,776 | 666,052
Granted grant date fair value ($/share) | $ / shares | $ 32.03 | $ 34.08 | $ 25.52
Vested (in shares) | (805,205) | (920,927) | (843,098)
Vested grant date fair value ($/share) | $ / shares | $ 16.75 | $ 12.17 | $ 11.00
Forfeited (in shares) | (119,777) | (72,034) | (79,577)
Forfeited grant date fair value ($/share) | $ / shares | $ 29.26 | $ 18.24 | $ 10.64
Non-vested at end of year (in shares) | 1,080,544 | 1,375,052 | 1,841,237
Non-vested outstanding at end of year grant date fair value ($/share) | $ / shares | $ 31.49 | $ 22.42 | $ 13.79
Performance share units, shares settled gross of shares for tax withholdings | 803,449 | 920,927 | 843,098
Shares held for settlement of income and payroll tax obligations (in shares) | (249,233) | (284,423) | (250,349)
Shares Issued in Period | 554,216 | 636,504 | 592,749
Number of Shares Represented by Each RSU | 1 |  |
Fair value of PSUs/RSUs Vested in Period | $ | $ 13.5 | $ 11.2 | $ 9.3

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X
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |