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EQUITY INCENTIVE PLAN - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock dividend payable $ 14,862,000   $ 14,605,000
Long-Term Equity-Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares available for future issuances (in shares) 2,540,097    
Performance-based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 2,200,000    
Compensation cost not yet recognized, period for recognition 1 year 7 months 6 days    
Long term incentive compensation expense $ 270,000 $ 578,000  
Common stock dividend payable 185,000    
Stock Awards Activity [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 3,300,000    
Compensation cost not yet recognized, period for recognition 1 year 6 months    
Common stock dividend payable $ 280,000    
Long term incentive compensation expense 433,000 408,000  
Other general and administrative expense $ 131,000 $ 123,000