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Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Stock-Based Compensation Plans              
Unrecognized compensation cost $ 2.3     $ 2.3   $ 2.3  
Weighted average life over which unrecognized compensation is expected to be recognized           2 years 10 days  
General and administrative expenses              
Stock-Based Compensation Plans              
Stock-based compensation expense       $ 0.5 $ 0.7 $ 2.9 $ 2.8
Restricted stock awards              
Stock-Based Compensation Plans              
Granted (in shares)           430,784  
Number of Shares              
Unvested at the beginning of the period (in shares)           317,048  
Granted (in shares)           430,784  
Vested (in shares)           (389,511)  
Forfeited (in shares)           (150)  
Unvested at the end of the period (in shares) 358,171     358,171   358,171  
Weighted-Average Grant-Date Fair Value              
Unvested at the beginning of the period (in dollars per share)           $ 8.08  
Granted (in dollars per share)           8.21  
Vested (in dollars per share)           8.09  
Forfeited (in dollars per share)           8.36  
Unvested at the end of the period (in dollars per share) $ 8.23     $ 8.23   $ 8.23  
Certain officers and employees | Restricted stock awards              
Stock-Based Compensation Plans              
Granted (in shares)     188,400        
Number of Shares              
Granted (in shares)     188,400        
Certain officers and employees | Restricted stock units              
Stock-Based Compensation Plans              
Granted (in shares)     56,450        
Number of Shares              
Granted (in shares)     56,450        
Non-executive director              
Stock-Based Compensation Plans              
The percent of sharebased compensation arrangement by sharebased payment award equity share awards paid quarterly in arrears       100.00%      
Non-executive director | Restricted stock awards              
Stock-Based Compensation Plans              
Granted (in shares) 15,105 7,600 7,575        
Number of Shares              
Granted (in shares) 15,105 7,600 7,575        
President and Chief Executive Officer | Restricted stock awards              
Stock-Based Compensation Plans              
Granted (in shares)     155,654        
Number of Shares              
Granted (in shares)     155,654