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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
ASSETS    
Allowance for doubtful notes receivable $ 275 $ 227
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) 43,465,880 38,274,770
Common stock, shares outstanding (in shares) 43,465,880 38,274,770
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) 4,545,016 5,031,473
Series B preferred stock, shares outstanding (in shares) 4,545,016 5,031,473
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