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EQUITY INCENTIVE PLAN - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock dividend payable $ 11,702,000 $ 11,702,000 $ 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) 2,861,645 2,861,645  
Performance-based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 1,100,000 $ 1,100,000  
Compensation cost not yet recognized, period for recognition   1 year 4 months 24 days  
Long term incentive compensation expense (236,000) $ 602,000  
Common stock dividend payable 109,000 109,000  
Stock Awards Activity [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award 2,600,000 $ 2,600,000  
Compensation cost not yet recognized, period for recognition   1 year 3 months 18 days  
Common stock dividend payable 288,000 $ 288,000  
Long term incentive compensation expense 376,000 1,100,000  
Other general and administrative expense $ 129,000 $ 374,000