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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
ASSETS      
Allowance for doubtful notes receivable $ 286 $ 286 $ 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) 57,311,232 57,311,232 38,274,770
Common stock, shares outstanding (in shares) 57,311,232 57,311,232 38,274,770
Series B Preferred Stock      
Liabilities [Abstract]      
Preferred stock dividend rate 5.50% 5.50% 5.50%
Series B preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Series B preferred stock, shares issued (in shares) 3,108,017 3,108,017 5,031,473
Series B preferred stock, shares outstanding (in shares) 3,108,017 3,108,017 5,031,473
Series D Preferred Stock      
Liabilities [Abstract]      
Preferred stock dividend rate 8.25% 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