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EQUITY INCENTIVE PLAN - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock dividend payable $ 7,110,000   $ 7,132,000
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) 2,919,087    
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 $ 578,000 $ 3,000  
Common stock dividend payable 105,000    
Stock Awards Activity [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 3,200,000    
Compensation cost not yet recognized, period for recognition 1 year 6 months    
Common stock dividend payable $ 191,000 191,000  
Long term incentive compensation expense 408,000 307,000  
Other general and administrative expense $ 123,000 $ 105,000