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Share Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2017
Apr. 30, 2014
Jun. 30, 2017
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     57,930
Total unrecognized compensation cost     $ 6.8
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)     33,670
Total unrecognized compensation cost     $ 4.7
Weighted-average period of total unrecognized compensation cost, in years     1 year 1 month 6 days
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 6 months
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     $ 9.4
Weighted-average period of total unrecognized compensation cost, in years     1 year 1 month 6 days