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Preferred Stock (Details)
 3 Months Ended 9 Months Ended 12 Months Ended 19 Months Ended
Jun. 30, 2021
USD ($)
Apr. 02, 2021
$ / shares
shares
Dec. 04, 2019
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
day
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Class of Stock [Line Items]                      
Series Preferred Stock       $ 1,977,000 $ 2,554,000 $ 6,258,000 $ 7,664,000        
Common Stock                      
Class of Stock [Line Items]                      
Common Shares Issued (in shares) | shares       120,000   7,291,000          
Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Maximum offering price     $ 40,000,000                
Percentage of the gross sales price     2.00%                
Series B Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock dividend rate       5.50% 5.50% 5.50% 5.50% 5.50%      
Initial conversion/redemption price (in dollars per share) | $ / shares       $ 18.70   $ 18.70          
Temporary equity conversion rate           1.3372          
Annual preferred stock dividend (in dollars per share) | $ / shares           $ 1.375          
Consecutive trading days | day           45          
Days ending prior to notice of conversion           3 days          
Redemption price (in dollars per share) | $ / shares       $ 25.00   $ 25.00          
Redemption percent of liquidation preference       103.00%   103.00%          
Liquidation preference per share (in dollars per share) | $ / shares       $ 25.00   $ 25.00          
Series Preferred Stock       $ 1,058,000 $ 1,729,000 $ 3,689,000 $ 5,189,000        
Preferred Shares Tendered (in shares) | shares       30,000   1,953,000          
Issuance of preferred stock (in shares) | shares             23,000        
Series Preferred Stock $ 66,064,000     $ 65,426,000 $ 107,352,000 $ 65,426,000 $ 107,352,000 $ 106,949,000 $ 66,064,000 $ 107,352,000 $ 106,920,000
Series B Preferred Stock | Preferred Stock                      
Class of Stock [Line Items]                      
Series Preferred Stock shares issued (in shares) | shares       0 0 0 23,000        
Gross proceeds received       $ 0 $ 0 $ 0 $ 439,000        
Commissions and other expenses       0 0 0 7,000        
Net proceeds       $ 0 $ 0 $ 0 $ 432,000        
Series B Preferred Stock | Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Shares sold (in shares) | shares                 65,000    
Proceeds received 1,200,000                    
Series B Preferred Stock | Minimum                      
Class of Stock [Line Items]                      
Percent of conversion price       110.00%   110.00%          
Series E Preferred Stock                      
Class of Stock [Line Items]                      
Initial conversion/redemption price (in dollars per share) | $ / shares       $ 25.00   $ 25.00          
Temporary equity conversion rate           5.69476          
Sale of temporary equity, offering price (in dollars per share) | $ / shares       $ 25.00   $ 25.00          
Period of preferred dividends in arrears (in months)           18 months          
Redemption fee, percent of stated value on the original issue date       8.00%   8.00%          
Redemption fee, percent of stated value beginning on the first anniversary       5.00%   5.00%          
Redemption fee, percent of stated value beginning on the third anniversary       0.00%   0.00%          
Issuance of preferred stock (in shares) | shares       266,000   266,000          
Net proceeds       $ 5,976,000   $ 5,976,000          
Series Preferred Stock 0     6,110,000   6,110,000   0 $ 0    
Adjustments to Series Preferred Stock           1,906,000   0      
Dividends declared on Series Preferred Stock       $ 90,000   $ 90,000          
Series E Preferred Stock | Initial Closing Date                      
Class of Stock [Line Items]                      
Temporary equity, dividend rate (as a percent)           0.0008%          
Series E Preferred Stock | First Anniversary From Initial Closing Date                      
Class of Stock [Line Items]                      
Temporary equity, dividend rate (as a percent)           0.0775%          
Series E Preferred Stock | Second Anniversary From Initial Closing Date                      
Class of Stock [Line Items]                      
Temporary equity, dividend rate (as a percent)           0.00075%          
Series E Preferred Stock | Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Sale of temporary equity, number of shares authorized in transaction (in shares) | shares   20,000,000                  
Sale of temporary equity, offering price (in dollars per share) | $ / shares   $ 25.00                  
Series E Preferred Stock | Dividend Reinvestment Plan                      
Class of Stock [Line Items]                      
Sale of temporary equity, number of shares authorized in transaction (in shares) | shares   8,000,000                  
Sale of temporary equity, offering price (in dollars per share) | $ / shares   $ 25.00                  
Series M Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock dividend rate           0.00082%          
Sale of temporary equity, offering price (in dollars per share) | $ / shares   $ 25.00   $ 25.00   $ 25.00          
Redemption fee, percent of stated value on the original issue date       1.50%   1.50%          
Redemption fee, percent of stated value beginning on the first anniversary       0.00%   0.00%          
Issuance of preferred stock (in shares) | shares       15,000   15,000          
Net proceeds       $ 355,000   $ 355,000          
Series Preferred Stock $ 0     361,000   361,000   0 $ 0    
Adjustments to Series Preferred Stock           (111,000)   $ 0      
Dividends declared on Series Preferred Stock       $ 4,000   $ 4,000          
Dividend rate (in dollars per share) | $ / shares           $ 2.05          
Dividend rate increase each year from original issuance (as a percent)           0.10%          
Dividend rate, maximum percentage of stated value       8.70%   8.70%          
Series M Preferred Stock | Equity Distribution Agreements                      
Class of Stock [Line Items]                      
Sale of temporary equity, number of shares authorized in transaction (in shares) | shares   20,000,000                  
Sale of temporary equity, offering price (in dollars per share) | $ / shares   $ 25.00                  
Series M Preferred Stock | Dividend Reinvestment Plan                      
Class of Stock [Line Items]                      
Sale of temporary equity, number of shares authorized in transaction (in shares) | shares   8,000,000                  
Sale of temporary equity, offering price (in dollars per share) | $ / shares   $ 25.00