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Equity Compensation Plans and Share-Based Compensation - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 01, 2016
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (shares) | shares   119,000 137,000 51,000
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]        
Options and warrants outstanding, intrinsic value   $ 2.7    
Options and warrants exercisable, intrinsic value   $ 1.0    
Options and warrants outstanding, weighted average remaining contractual term (years)   2 years 6 months    
Options and warrants exercises in period, total intrinsic value   $ 0.5 $ 0.3 $ 0.0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Shares issued in period | shares 83,000 0    
Total compensation cost not yet recognized, nonvested stock options   $ 0.1    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (shares) | shares   102,000 117,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Vesting period   3 years    
Stock Options and Warrants | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Stock options        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Weighted-average period of recognition (years)   9 months 18 days    
Nonvested “restricted” stock        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Total intrinsic value for nonvested common stock awards vested during period   $ 1.6 $ 0.7 $ 4.9
Total intrinsic value for nonvested common stock awards outstanding   $ 18.4    
Weighted-average period of recognition (years)   1 year 4 months 24 days    
Total compensation cost not yet recognized, nonvested common stock awards   $ 7.9    
Nonvested “restricted” stock | Measurement period beginning 2014 through 2018        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Shares issued in period | shares   40,000    
Nonvested stock, number of annual performance measurement periods   4    
Nonvested “restricted” stock | Minimum        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Vesting period   5 years    
Nonvested “restricted” stock | Maximum        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]        
Vesting period   6 years    
Prior to merger        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant | shares   778,000    
After merger        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant | shares   1,995,000