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Compensation Plans: Stock Based (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 02, 2023
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award          
Shares available for grant | shares   3,700,000   3,700,000  
Performance Shares (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award          
Award Vesting Period       3 years  
Stock-based compensation expense | $   $ 0.2 $ 0.7 $ 0.8 $ 1.4
Unrecognized stock based compensation expense | $   $ 4.1   $ 4.1  
Performance Shares (PSUs) | Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 256,633        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $ $ 7.7        
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 | $   $ 3.4 $ 3.2 $ 6.7 $ 6.5
Unrecognized stock based compensation expense | $   $ 17.4   $ 17.4  
Number of shares represented by each RSU | shares   1   1  
Restricted Stock Units (RSUs) | Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 591,361        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $ $ 18.7        
Shares Withheld for Tax Withholding Obligation | shares 248,963        
Shares Issued in Period | shares 553,442