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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
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