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Share Based Compensation Plans: Performance Share Plan (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
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 | $ $ 14,000    
Stock Issued During Period, Shares, Treasury Stock Reissued 28 14 44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid | $ $ 1,647 $ 1,100 $ 2,860
Restricted Stock and RSUs, total fair value of shares vested | $ $ 3,294 $ 2,199 $ 5,720
Performance Goal - Percentile of Peer Group Performance 3000.00%    
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 | $ $ 2,100    
Performance Shares, Number of Shares Authorized   36 36
Performance Share Award, Percentage of Target 40.17%    
Weighted Average Grant Date Fair Value (usd per share) | $ / shares   $ 81.42 $ 68.72
Blended volatility   18.00% 21.00%
Volatility Rate - Historic 0.50    
Volatility Rate - Implied 0.50    
Volatility range for the peer group, Maximum 76.00%    
Target shares, value | $ $ 1,000    
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award, Percentage of Target 0.00% 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% 200.00%
Performance Shares, Equity Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares, Number of Shares Authorized 36 61  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 68.14 $ 69.71  
Performance Shares, Granted in Period 0    
Weighted Average Grant Date Fair Value (usd per share) | $ / shares $ 0    
Shares Forfeited 0    
Forfeited (usd per share) | $ / shares $ 0    
Shares Vested (25)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares $ 61.82    
Performance Shares, Liability Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares, Number of Shares Authorized 36 61  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 31.51    
Performance Shares, Granted in Period 0    
Shares Forfeited 0    
Shares Vested (25)