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Equity-Based Compensation (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 29, 2019
Aug. 31, 2017
Mar. 31, 2020
Mar. 31, 2019
Jul. 31, 2017
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued during period, issued for services (in shares)     0 0  
Amended and Restated RSP | Unvested Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Benchmark for RSP issuance (in shares)   $ 30,000      
Amended and Restated RSP | Unvested Restricted Stock | Chairman          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted share vesting period   7 years      
Granted (in shares)   300,000      
Amended and Restated RSP | Unvested Restricted Stock | Independent Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted share vesting period   5 years      
Granted (in shares)   25,000      
Restricted Share Plan | Unvested Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum authorized amount as a percentage of shares authorized     5.00%    
Number of shares authorized (in shares)     3,400,000    
Shares granted automatically upon election to board of directors, in shares         1,333
Restricted share vesting period     5 years    
Granted (in shares)     0    
Nonvested awards, compensation cost not yet recognized     $ 5,100,000    
Nonvested awards, compensation cost not yet recognized, period for recognition     3 years 10 months 24 days    
Share-based payment arrangement, expense     $ 300,000 $ 300,000  
Restricted Share Plan | Unvested Restricted Stock | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 15,000