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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Apr. 02, 2021
ASSETS        
Allowance for doubtful notes receivable $ 126 $ 126 $ 227  
Preferred stock, $0.01 value, 80,000,000 shares authorized:        
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01  
Preferred stock, shares authorized (in shares) 80,000,000 80,000,000 80,000,000  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01  
Common stock, shares authorized (in shares) 250,000,000 250,000,000 250,000,000  
Common stock, shares issued (in shares) 63,974,117 63,974,117 38,274,770  
Common stock, shares outstanding (in shares) 63,974,117 63,974,117 38,274,770  
Series B Preferred Stock        
Liabilities [Abstract]        
Preferred stock dividend rate 5.50% 5.50% 5.50%  
Series preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01  
Series B preferred stock, shares issued (in shares) 3,078,017 3,078,017 5,031,473  
Series B preferred stock, shares outstanding (in shares) 3,078,017 3,078,017 5,031,473  
Series E Preferred Stock        
Liabilities [Abstract]        
Series preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01  
Series B preferred stock, shares issued (in shares) 265,637 265,637 0  
Series B preferred stock, shares outstanding (in shares) 265,637 265,637 0  
Series M Preferred Stock        
Liabilities [Abstract]        
Preferred stock dividend rate   0.00082%    
Series preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01 $ 0.01
Series B preferred stock, shares issued (in shares) 14,644 14,644 0  
Series B preferred stock, shares outstanding (in shares) 14,644 14,644 0  
Series D Preferred Stock        
Liabilities [Abstract]        
Preferred stock dividend rate 8.25% 8.25%    
Preferred stock, $0.01 value, 80,000,000 shares authorized:        
Preferred stock, shares issued (in shares) 1,600,000 1,600,000 1,600,000  
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000 1,600,000