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Share Based Compensation Plans: Performance Share Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Share Award Payout, Shares of Common Stock Percentage 100.00%      
Unrecognized compensation expense $ 10.6      
Performance Shares, Number of Shares Authorized       35,571
Stock Issued During Period, Shares, Treasury Stock Reissued 4,958 7,582 27,515  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid $ 0.3 $ 0.5 $ 1.6  
Restricted Stock and RSUs, total fair value of shares vested $ 0.7 $ 1.0 $ 3.3  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Share Award Payout, Cash Percentage 50.00%      
Performance Share Award Payout, Shares of Common Stock Percentage 50.00%      
Performance Share Award, Percentage of Target 16.21%      
Blended volatility       18.00%
Volatility Rate - Historic       0.50
Volatility Rate - Implied       0.50
Volatility range for the peer group, Maximum 39.00% 67.00%    
Target shares, value $ 0.5      
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Share Award, Percentage of Target 0.00%     0.00%
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Share Award, Percentage of Target 200.00%     200.00%
Performance Shares, Equity Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Shares, Number of Shares Authorized 0 18,105    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 0 $ 81.42    
Performance Shares, Granted in Period 0      
Weighted Average Grant Date Fair Value (usd per share) $ 0      
Shares Forfeited 0      
Forfeited (usd per share) $ 0      
Shares Vested (18,105)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 81.42      
Performance Shares, Liability Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Shares, Number of Shares Authorized 0 18,105    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 0      
Performance Shares, Granted in Period 0      
Shares Vested (18,105)