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Compensation Plans: Stock Based (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award      
Shares available for grant | shares 4,900,000 4,900,000  
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, Vested in Period, Multiplier Assumed, TSR Cap | shares   1  
Stock-based compensation expense   $ 0.7 $ 3.2
Unrecognized stock based compensation expense $ 0.7 $ 0.7  
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      
Stock-based compensation expense   $ 3.3 $ 2.2
Unrecognized stock based compensation expense $ 17.2 $ 17.2  
Number of shares represented by each RSU | shares 1 1