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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for grant 4,400,000 4,400,000   4,400,000    
Performance Shares (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense | $   $ 1.6 $ 2.9 $ 7.0 $ 8.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed 1 1   1    
Multiplier applied to PSU awards at settlement 0.9 0.9   0.9    
Award Vesting Period (on non-printing section) 3 years          
Unrecognized stock based compensation expense | $ $ 8.1 $ 8.1   $ 8.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,184,892 1,184,892   1,184,892   2,022,585
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 17.56 $ 17.56   $ 17.56   $ 16.87
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       (791,962)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 15.85    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (45,731)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares       $ 16.69    
Shares Withheld for Tax Withholding Obligation       215,451    
Shares Issued in Period       485,060    
Performance Shares (PSUs) | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Multiplier applied to PSU awards at settlement 0 0   0    
Performance Shares (PSUs) | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Multiplier applied to PSU awards at settlement 2 2   2    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense | $   $ 1.8 $ 2.9 $ 7.1 $ 8.4  
Award Vesting Period (on non-printing section) 3 years          
Unrecognized stock based compensation expense | $ $ 8.6 $ 8.6   $ 8.6    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 709,992 709,992   709,992   1,532,131
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 15.29 $ 15.29   $ 15.29   $ 16.01
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       (744,325)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 16.74    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (77,814)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares       $ 15.67    
Shares Withheld for Tax Withholding Obligation       209,126    
Number of shares represented by each RSU 1 1   1