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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2018
shares
Sep. 30, 2019
USD ($)
shares
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share available for grant 4,100,000 4,100,000       4,100,000    
Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued to directors     96,719   58,572      
Performance Shares (PSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Multiplier applied to PSU awards at settlement 0 0       0    
Award vesting period 3 years              
Stock-based compensation expense | $   $ 2.9   $ 3.0   $ 8.6 $ 7.7  
Unrecognized stock based compensation expense | $ $ 19.7 $ 19.7       $ 19.7    
Non-vested PSUs/RSUs [1] 2,117,364 2,117,364       2,117,364   1,711,259
Fair value of non-vested PSUs/RSUs | $ / shares $ 16.86 $ 16.86       $ 16.86   $ 20.68
PSUs/RSUs granted in period [1]           793,125    
Fair vale of PSUs/RSUs granted in period, per share | $ / shares           $ 12.80    
Vested PSUs/RSUs [1]           (346,021)    
Fair value of vested PSUs/RSUs | $ / shares           $ 26.31    
Forfeited PSUs/RSUs [1]           (40,999)    
Fair value of forfeited PSUs/RSUs | $ / shares           $ 17.96    
PSU multiplier cap           1    
Fair value of PSUs/RSUs granted in period, total | $           $ 10.2    
Net shares of common stock issued upon settlement           0    
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]                
Award vesting period 3 years              
Stock-based compensation expense | $   $ 2.9   $ 3.0   $ 8.4 $ 8.0  
Unrecognized stock based compensation expense | $ $ 21.4 $ 21.4       $ 21.4    
Non-vested PSUs/RSUs 1,644,372 1,644,372       1,644,372   1,243,163
Fair value of non-vested PSUs/RSUs | $ / shares $ 16.04 $ 16.04       $ 16.04   $ 21.50
PSUs/RSUs granted in period           978,932    
Fair vale of PSUs/RSUs granted in period, per share | $ / shares           $ 12.36    
Vested PSUs/RSUs           (466,535)    
Fair value of vested PSUs/RSUs | $ / shares           $ 21.93    
Forfeited PSUs/RSUs           (111,188)    
Fair value of forfeited PSUs/RSUs | $ / shares           $ 19.94    
Fair value of PSUs/RSUs granted in period, total | $           $ 12.1    
Number of shares represented by each RSU 1 1       1    
Net shares of common stock issued upon settlement           334,399    
[1]
(1)  
The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier which ranges from zero to two.