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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award            
Shares available for grant 4,200,000 4,200,000   4,200,000    
Performance Shares (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award            
Multiplier applied to PSU awards at settlement 1.0 1.0   1.0    
Award Vesting Period 3 years          
Stock-based compensation expense | $   $ 0.8 $ 1.6 $ 5.3 $ 7.0  
Unrecognized stock based compensation expense | $ $ 2.2 $ 2.2   $ 2.2    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed 1 1   1    
Shares Issued in Period       234,823    
Shares Withheld for Tax Withholding Obligation       112,919    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 465,847 465,847   465,847   830,464
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 12.80 $ 12.80   $ 12.80   $ 17.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       (352,395)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 23.81    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (12,222)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares       $ 15.76    
Performance Shares (PSUs) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award            
Multiplier applied to PSU awards at settlement 0 0   0    
Performance Shares (PSUs) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award            
Multiplier applied to PSU awards at settlement 2 2   2    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award            
Stock-based compensation expense | $   $ 2.9 $ 1.8 $ 7.2 $ 7.1  
Unrecognized stock based compensation expense | $ $ 23.7 $ 23.7   $ 23.7    
Number of shares represented by each RSU 1 1   1    
Shares Issued in Period       268,114    
Shares Withheld for Tax Withholding Obligation       106,543    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,296,713 2,296,713   2,296,713   2,097,860
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 12.23 $ 12.23   $ 12.23   $ 8.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       661,402    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 25.47    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       (394,930)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 16.69    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (67,619)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares       $ 10.25