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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Dec. 31, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Shares available for grant 2,800,000   2,800,000    
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, Granted in Period, Total Fair Value | $     $ 7.7    
Stock-based compensation expense | $ $ 1.0 $ 0.6 1.8 $ 2.0  
Unrecognized stock based compensation expense | $ $ 9.9   $ 9.9    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 497,973   497,973   273,258
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 27.75   $ 27.75   $ 26.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     256,633    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 29.93    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (31,918)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares     $ 25.99    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed 1   1    
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          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $     $ 19.8    
Number of shares represented by each RSU 1   1    
Stock-based compensation expense | $ $ 4.1 $ 3.5 $ 10.8 $ 10.0  
Unrecognized stock based compensation expense | $ $ 30.0   $ 30.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,093,257   1,093,257   1,375,052
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 31.42   $ 31.42   $ 22.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     620,420    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 31.92    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (803,449)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 16.72    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (98,766)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares     $ 28.86    
Shares Withheld for Tax Withholding Obligation     249,233    
Shares Issued in Period     554,216