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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share-based compensation plans | plan 1    
Number of shares authorized | shares 13,118,430    
Capitalization of stock based compensation expense $ 0.0    
Fair value of options vested during the period 3.8 $ 3.2 $ 1.9
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Peer volatility rate     25.00%
Historic volatility   100.00% 75.00%
Proceeds from stock options exercised 0.7 $ 0.3  
Aggregate intrinsic value of options exercised 0.7   $ 0.0
Unrecognized compensation expense $ 4.6    
Weighted average years expense to be recognized over 1 year 6 months 18 days    
Stock-settled stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of options exercised $ 2.0 $ 3.6 $ 0.7
Stock Options and SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 4.3    
Weighted average years expense to be recognized over 1 year 8 months 11 days    
Shares outstanding | shares 2,007,117 2,430,683  
Weighted average grant date fair value | $ / shares $ 7.58 $ 6.12 $ 7.14
Fair value of stock awards vested $ 10.3 $ 3.2 $ 1.0
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 7.0    
Weighted average years expense to be recognized over 1 year 8 months 6 days    
Shares outstanding | shares 3,197,735 2,837,162  
Weighted average grant date fair value | $ / shares $ 7.52 $ 6.14 $ 7.59
Fair value of stock awards vested $ 5.4 $ 4.4 $ 3.0
Share-based Compensation, Equity Instruments Other than Options, Shares Called upon Vested | shares 1    
Minimum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Percentage awarded 0.00%    
Maximum | Stock Options and SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise period 7 years    
Maximum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage awarded 150.00%    
Fully Vested On The Grant Date | RSUs | Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense, shares that vests on grant date $ 0.8 $ 0.8 $ 0.9