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Share Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2018
Sep. 30, 2018
Dec. 31, 2017
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   41,570  
Total unrecognized compensation cost   $ 5.9  
Weighted-average period of total unrecognized compensation cost, in years   1 year 1 month 6 days  
Restricted Stock | Employees and Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Cash-settled Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Granted (in shares)   28,925  
Total unrecognized compensation cost   $ 4.6  
Weighted-average period of total unrecognized compensation cost, in years   1 year 1 month 6 days  
Performance Shares Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Granted (in shares)   52,375 62,755
Payout percent     239.00%
Stock issued during period (in shares) 143,897    
Total unrecognized compensation cost   $ 10.0  
Weighted-average period of total unrecognized compensation cost, in years   1 year  
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost   $ 15.3  
Weighted-average period of total unrecognized compensation cost, in years   1 year 4 months 24 days