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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Shares available for grant 3,800,000   3,800,000    
Performance Shares (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award          
Multiplier applied to PSU awards at settlement 2.0   2.0    
Award Vesting Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed, 2019 PSU TSR Cap 1   1    
Stock-based compensation expense | $ $ 0.6 $ 0.8 $ 2.0 $ 5.3  
Unrecognized stock based compensation expense | $ $ 6.8   $ 6.8    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 276,010   276,010   464,483
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 26.67   $ 26.67   $ 12.80
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     276,010    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 26.67    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (460,928)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 12.80    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (3,555)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares     $ 12.80    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed 1   1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $     $ 7.4    
Shares Issued in Period     654,923    
Shares Withheld for Tax Withholding Obligation     349,487    
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          
Number of shares represented by each RSU 1   1    
Stock-based compensation expense | $ $ 3.5 $ 2.9 $ 10.0 $ 7.2  
Unrecognized stock based compensation expense | $ $ 27.8   $ 27.8    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,397,382   1,397,382   1,841,237
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 22.41   $ 22.41   $ 13.79
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     526,776    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 34.08    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (920,927)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 12.17    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (49,704)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares     $ 16.62    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $     $ 18.0    
Shares Issued in Period     636,504    
Shares Withheld for Tax Withholding Obligation     284,423