Annual report pursuant to Section 13 and 15(d)

Equity and Mezzanine Equity - Additional Information (Details)

v3.20.4
Equity and Mezzanine Equity - Additional Information (Details)
12 Months Ended
Sep. 22, 2020
USD ($)
$ / shares
shares
Jan. 01, 2019
Dec. 31, 2020
USD ($)
holder
quarter
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 23, 2020
USD ($)
$ / shares
Aug. 04, 2020
$ / shares
shares
Jun. 15, 2016
shares
Jun. 04, 2015
shares
Equity [Line Items]                
Authority to issue stock (in shares)     33,750,000          
Shares of common stock authorized (in shares)     18,750,000 18,750,000        
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01        
Ownership interest of operating partnership     98.53%          
Units to stock conversion ratio     1          
Common units outstanding (in shares)     15,227,758 14,105,712        
Preferred Stock, Redemption Price Per Share | $ / shares     $ 25.00          
Stock Repurchased and Retired During Period, Shares 71,343              
Stock Repurchased And Retired, Price Per Share | $ / shares $ 15.50              
Stock Repurchased and Retired During Period, Value | $ $ 1,830,000              
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Available for Issuance           5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Available For Issuance, Price Per Share | $ / shares           $ 1.85    
Trust Owning                
Equity [Line Items]                
Common units outstanding (in shares)     15,003,329 13,871,693        
Maximum | Exchange of Stock for Stock                
Equity [Line Items]                
Shares of common stock authorized (in shares)     18,750,000          
Preferred stock, shares authorized (in shares)     15,000,000          
Common Stock                
Equity [Line Items]                
Issuance of common stock under Share Incentive Plan (in shares)       181,807        
Series D Cumulative Convertible Preferred Stock                
Equity [Line Items]                
Preferred stock, shares authorized (in shares)     4,000,000          
Preferred stock shares redeemed (in shares)     3,529,293 3,600,636        
Series A Preferred Stock                
Equity [Line Items]                
Preferred stock, shares authorized (in shares)     4,500 4,500        
Preferred stock, Shares Issued (in shares)     562 562        
Preferred stock outstanding (in shares)     562 562        
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 1,000 $ 1,000        
Preferred Stock, Liquidation Preference Value | $     $ 562,000 $ 562,000        
Preferred stock cumulative dividend rate per annum     9.00%          
Preferred stock shares redeemed (in shares)     562          
Percentage of price at which common stock is sold in secondary offering     103.00%          
Series B Preferred Stock                
Equity [Line Items]                
Preferred stock, shares authorized (in shares)     5,000,000 5,000,000        
Preferred stock, Shares Issued (in shares)     1,875,748 1,875,748        
Preferred stock outstanding (in shares)     1,875,748 1,875,748        
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 25.00 $ 25.00        
Preferred Stock, Liquidation Preference Value | $     $ 46,900,000 $ 46,900,000        
Preferred stock cumulative dividend rate per annum     9.00%          
Convertible Preferred Stock, Terms of Conversion     20 days          
Adjusted conversion price of preferred to common (in usd per share) | $ / shares     $ 58          
Preferred Stock, Redemption Price Per Share | $ / shares     $ 40.00          
Series D Preferred Stock                
Equity [Line Items]                
Preferred stock, shares authorized (in shares)     4,000,000 4,000,000        
Preferred stock, Shares Issued (in shares)     3,529,293 3,600,636        
Preferred stock outstanding (in shares)     3,529,293 3,600,636        
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 25.00 $ 25.00        
Preferred Stock, Liquidation Preference Value | $     $ 109,130,000 $ 101,660,000        
Preferred stock cumulative dividend rate per annum   10.75%            
Preferred Stock, Redemption Price Per Share | $ / shares     $ 25.00          
Preferred Stock, Initial Liquidation Preference Per Share | $ / shares     $ 2.1875          
Preferred Stock, Dividend Over Initial Rate, Percentage     2.00%          
Secondary offering common stock price per share (in usd per share) | $ / shares     $ 16.96          
Ratio of Asset Coverage to Total Debt     200.00%          
Preferred Stock, Period To Pay Dividends After Payment Date     3 days          
Preferred Stock, Liquidation Preference Per Share Per Annum | $ / shares     $ 0.50          
Preferred Stock, Minimum Consecutive Quarterly Periods for Dividends in Arrears | quarter     6          
Preferred Stock, Increase in Number or Holders of Shares | holder     2          
Preferred Stock, Percentage of Holders of Shares Outstanding     20.00%          
Series D Preferred Stock | Minimum                
Equity [Line Items]                
Preferred stock cumulative dividend rate per annum     8.75%          
Series D Preferred Stock | Maximum                
Equity [Line Items]                
Preferred stock cumulative dividend rate per annum     14.00%          
Series D Preferred Stock | Modified Dutch Auction                
Equity [Line Items]                
Stock repurchase program, authorized amount | $         $ 19,000,000.00      
Stock repurchase program, maximum authorized repurchase price (in usd per share) | $ / shares         $ 18.00      
Stock repurchase program, minimum authorized repurchase price (in usd per share) | $ / shares         $ 15.50      
Common Stock | 2015 Incentive Plan                
Equity [Line Items]                
Number of shares authorized under Share Incentive Plan               125,000
Shares available for issuance under the Company’s Share Incentive Plan (in shares)     41,104          
Issuance of common stock under Share Incentive Plan (in shares)     0 0        
Common Stock | 2016 Incentive Plan                
Equity [Line Items]                
Number of shares authorized under Share Incentive Plan             625,000  
Shares available for issuance under the Company’s Share Incentive Plan (in shares)     132,707          
Issuance of common stock under Share Incentive Plan (in shares)     0 181,807,000