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Share-based Compensation Plans - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
plan
shares
Jun. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based compensation plans in effect | plan     2  
Performance-based liability awards, measurement period (in years)     3 years  
Share-based compensation expenses | $ $ 1.7 $ 1.6 $ 2.8 $ 2.8
Compensation expense (benefit) related to cash awards | $ 0.1 0.2 (0.2) (0.1)
Total unrecognized compensation expense | $ $ 9.4   $ 9.4  
Total unrecognized compensation expense, weighted average period of recognition     2 years 7 months 6 days  
2012 Omnibus Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for grant (in shares) 3,500,000   3,500,000  
Number of shares terminated (in shares)     149,514  
2019 Omnibus Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (in shares) 2,500,000   2,500,000  
Number of shares terminated (in shares)     588,002  
Inducement Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for grant (in shares) 6,000,000.0   6,000,000.0  
Number of shares available for issuance (in shares) 5,000,000.0   5,000,000.0  
Number of shares terminated (in shares)     78,705  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service based restricted stock, shares granted (in shares)     211,769  
Share-based compensation expenses | $ $ 1.0 1.0 $ 1.8 2.0
Restricted stock | Trustee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service based restricted stock, vesting period (in years)     1 year  
Restricted stock | Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service based restricted stock, shares granted (in shares)     286,944  
Restricted stock | Minimum | Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service based restricted stock, vesting period (in years)     3 years  
Restricted stock | Salary Exchange Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service based restricted stock, shares granted (in shares)     32,069  
Equity Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses | $ $ 0.6 $ 0.4 $ 1.2 $ 0.9