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EQUITY INCENTIVE PLAN - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock dividend payable $ 7,132,000 $ 18,487,000  
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) 3,312,051    
Performance-based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 1,000,000    
Compensation cost not yet recognized, period for recognition 1 year 6 months    
Long term incentive compensation expense $ 104,000 149,000 $ 204,000
Common stock dividend payable 76,000 193,000  
Stock Awards Activity [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total of unrecognized compensation expense for unvested stock award $ 1,800,000    
Compensation cost not yet recognized, period for recognition 1 year 3 months 18 days    
Common stock dividend payable $ 253,000 134,000  
Long term incentive compensation expense 1,200,000 834,000 828,000
Other general and administrative expense $ 450,000 $ 421,000 $ 409,000
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share awards contractual term 10 years    
Weighted average remaining contractual term 3 months 18 days    
Exercisable, intrinsic value $ 0