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Compensation Plans: Stock Based (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) shares $ / shares | Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 USD ($) shares $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant | 3,800,000 |  |
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 | 0.9
Award vesting period | 3 years |  |
TSR multiplier cap | 1 |  |
Stock-based compensation expense | $ | $ 2.6 | $ 6.0 | $ 4.4
Unrecognized stock based compensation expense | $ | $ 6.1 |  |
Non-vested at beginning of year (in shares) | 464,483 | 830,464 | 2,022,585
Non-vested outstanding at the beginning of the period grant date fair value ($/share) | $ / shares | $ 12.80 | $ 17.52 | $ 16.87
Granted (in shares) | 276,010 | 0 | 0
Granted grant date fair value ($/share) | $ / shares | $ 26.67 | $ 0 | $ 0
Vested (in shares) | (461,387) | (352,395) | (792,572)
Vested grant date fair value ($/share) | $ / shares | $ 12.81 | $ 23.81 | $ 15.85
Forfeited (in shares) | (5,848) | (13,586) | (399,549)
Forfeited grant date fair value ($/share) | $ / shares | $ 18.24 | $ 15.46 | $ 17.56
Non-vested at end of year (in shares) | 273,258 | 464,483 | 830,464
Non-vested outstanding at the end of the period grant date fair value ($/share) | $ / shares | $ 26.67 | $ 12.80 | $ 17.52
Multiplier assumed | 1 | 1 | 1
Fair value of PSUs/RSUs granted in period | $ | $ 7.4 |  |
Performance share units, shares settled gross of shares for tax withholdings | 1,004,410 | 347,742 | 700,511
Shares held for settlement of income and payroll tax obligations (in shares) | (349,487) | (112,919) | (215,451)
Shares Issued in Period | 654,923 | 234,823 | 485,060
Fair value of PSUs/RSUs Vested in Period | $ | $ 12.3 | $ 8.4 | $ 12.6
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 | $ | $ 13.5 | $ 10.2 | $ 8.7
Unrecognized stock based compensation expense | $ | $ 24.4 |  |
Non-vested at beginning of year (in shares) | 1,841,237 | 2,097,860 | 1,532,131
Non-vested outstanding at the beginning of the period grant date fair value ($/share) | $ / shares | $ 13.79 | $ 8.83 | $ 16.01
Granted (in shares) | 526,776 | 666,052 | 1,458,869
Granted grant date fair value ($/share) | $ / shares | $ 34.08 | $ 25.52 | $ 5.98
Vested (in shares) | (920,927) | (843,098) | (746,132)
Vested grant date fair value ($/share) | $ / shares | $ 12.17 | $ 11.00 | $ 16.74
Forfeited (in shares) | (72,034) | (79,577) | (147,008)
Forfeited grant date fair value ($/share) | $ / shares | $ 18.24 | $ 10.64 | $ 15.34
Non-vested at end of year (in shares) | 1,375,052 | 1,841,237 | 2,097,860
Non-vested outstanding at the end of the period grant date fair value ($/share) | $ / shares | $ 22.42 | $ 13.79 | $ 8.83
Fair value of PSUs/RSUs granted in period | $ | $ 18.0 | $ 17.0 | $ 8.7
Performance share units, shares settled gross of shares for tax withholdings | 920,927 | 843,098 | 746,132
Shares held for settlement of income and payroll tax obligations (in shares) | (284,423) | (250,349) | (209,173)
Shares Issued in Period | 636,504 | 592,749 | 536,959
Number of Shares Represented by Each RSU | 1 |  |
Fair value of PSUs/RSUs Vested in Period | $ | $ 11.2 | $ 9.3 | $ 12.5

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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