Quarterly report pursuant to Section 13 or 15(d)

MANDATORILY-REDEEMABLE PREFERRED STOCK (Details)

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MANDATORILY-REDEEMABLE PREFERRED STOCK (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 07, 2021
Feb. 12, 2021
Jan. 31, 2021
Aug. 31, 2016
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]                
Proceeds from issuance of preferred and common equity           $ 161,318 $ 55,231  
Additional shares of common stock issued (in shares) 850,000              
Offering costs           $ 4,359 3,636  
Series A Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Dividend rate       6.375%        
Preferred stock, par value (in dollars per share)       $ 0.001   $ 0.001   $ 0.001
Preferred stock, shares issued (in shares)       1,150,000   0   1,150,000
Redemption price (in dollars per share)   $ 25.00            
Redemptions of preferred stock   $ 28,800       $ 28,750 $ 0  
Series A Preferred Stock | Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Average sales price (in dollars per share)       $ 25.00        
Proceeds from issuance of preferred stock       $ 28,800        
Proceeds from issuance of preferred and common equity       $ 27,600        
Allowance for credit loss, writeoff         $ 127      
Series D Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Dividend rate     5.00%          
Preferred stock, par value (in dollars per share)     $ 0.001     $ 0.001   $ 0.001
Preferred stock, shares issued (in shares)     2,415,000     2,415,000   0
Redemption price (in dollars per share)           $ 25.00    
Offering costs     $ 2,100          
Series D Preferred Stock | Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Average sales price (in dollars per share)     $ 25.00          
Proceeds from issuance of preferred stock     $ 60,400     $ 62,900    
Proceeds from issuance of preferred and common equity     $ 58,300          
Series D Preferred Stock | Preferred Stock | Level 1                
Subsidiary, Sale of Stock [Line Items]                
Average sales price (in dollars per share)           $ 26.03