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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
ASSETS    
Allowance for doubtful notes receivable $ 227 $ 153
Liabilities [Abstract]    
Series B preferred stock, shares outstanding (in shares) 4,277,000 4,538,000
Preferred stock, $0.01 value, 80,000,000 shares authorized:    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 80,000,000 80,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 38,274,770 32,885,217
Common stock, shares outstanding (in shares) 38,274,770 32,885,217
Series B Preferred Stock    
Liabilities [Abstract]    
Preferred stock dividend rate 5.50% 5.50%
Series B preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Series B preferred stock, shares issued (in shares) 5,031,473 5,008,421
Series B preferred stock, shares outstanding (in shares) 5,031,473 5,008,421
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
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000