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Equity Incentive Programs (Stock Options Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense $ 11,800,000   $ 11,800,000  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Options granted (in shares) 0 0 0 0
Compensation expense $ 0 $ 0 $ 0 $ 0
Estimated future compensation expense 0   0  
Proceeds from stock options exercised $ 0 $ 0 $ 0 $ 0
Annual Anniversary Grant Date of Award | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earliest expiration period of award after event     10 years  
Termination for Death | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earliest expiration period of award after event     24 months  
Termination for Retirement or Disability | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earliest expiration period of award after event     36 months  
Employment Terminated, Any Other Reason | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earliest expiration period of award after event     90 days  
Vested in the first year | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of options vested     0.00%  
Vested in the second year | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of options vested     33.33%  
Vested in third year | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of options vested     33.33%  
Vested in fourth year | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of options vested     33.33%