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Share Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Dec. 31, 2018
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   4 years  
Total unrecognized compensation cost   $ 19.7  
Weighted-average period of total unrecognized compensation cost, in years   1 year 7 months 6 days  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   32,945  
Total unrecognized compensation cost   $ 7.5  
Weighted-average period of total unrecognized compensation cost, in years   1 year 2 months 12 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)   24,305  
Total unrecognized compensation cost   $ 5.5  
Weighted-average period of total unrecognized compensation cost, in years   1 year 2 months 12 days  
Performance Shares Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Granted (in shares)   50,255 69,995
Payout percent     250.00%
Stock issued during period (in shares) 174,994    
Total unrecognized compensation cost   $ 13.5  
Weighted-average period of total unrecognized compensation cost, in years   1 year 2 months 12 days