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Share Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 28, 2014
Sep. 30, 2017
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     59,010
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)     34,290
Total unrecognized compensation cost     $ 4.3
Weighted-average period of total unrecognized compensation cost, in years     1 year
Performance Shares Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Granted (in shares)   63,325 65,530
Payout percent 141.00%    
Stock issued during period (in shares) 89,288    
Total unrecognized compensation cost     $ 8.0
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     $ 13.9
Weighted-average period of total unrecognized compensation cost, in years     1 year 4 months 24 days