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Share Based Compensation Plans: Performance Share Plan (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
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 $ 12,000    
Performance Shares, Number of Shares Authorized     36
Stock Issued During Period, Shares, Treasury Stock Reissued 8 28 14
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid $ 519 $ 1,647 $ 1,100
Restricted Stock and RSUs, total fair value of shares vested $ 1,038 $ 3,294 $ 2,199
Performance Goal - Percentile of Peer Group Performance 2600.00%    
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%    
The percentage paid in cash for the accrued equity portion of the performance share plan upon change in control 100.00%    
Unrecognized compensation expense $ 1,400    
Performance Share Award, Percentage of Target 27.00%    
Weighted Average Grant Date Fair Value (usd per share)     $ 81.42
Blended volatility     18.00%
Volatility Rate - Historic     0.50
Volatility Rate - Implied     0.50
Volatility range for the peer group, Maximum 67.00% 76.00%  
Target shares, value $ 700    
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 18 36  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 81.42 $ 68.14  
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)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 68.72    
Performance Shares, Liability Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares, Number of Shares Authorized 18 36  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 32.74    
Shares Vested (18)