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Share-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares)     662,769 331,616
Weighted average fair value at date of grant for options granted (in usd per share)     $ 2.91 $ 2.72
Share-based compensation expense $ 3.3 $ 1.4 $ 8.1 $ 4.0
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 11.8   $ 11.8  
Weighted average remaining period     2 years 3 months 18 days  
Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining period     2 years 15 days  
Intrinsic value of options outstanding 6.1   $ 6.1  
Average remaining life of option outstanding     6 years 6 months 11 days  
Intrinsic value of exercisable options 5.6   $ 5.6  
Average remaining life of exercisable options     6 years 3 months 11 days  
Compensation expense $ 1.9   $ 1.9  
Unvested shares expected to vest (in shares) 1,283,433   1,283,433  
Weighted average remaining life     7 years 7 months 28 days  
Weighted average exercise price (in usd per share) $ 7.42   $ 7.42  
Intrinsic value $ 0.5   $ 0.5  
Omnibus Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized to issue (in shares) 3,500,000   3,500,000