Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Aug. 02, 2018
USD ($)
$ / shares
Jul. 31, 2018
USD ($)
Jul. 20, 2018
USD ($)
installment
May 02, 2018
$ / shares
Mar. 06, 2018
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2017
Subsequent Event [Line Items]              
Dividends declared           $ 2,790  
Series B preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares       $ 0.609375 $ 0.609375    
Preferred stock, dividend rate (as percent)       9.75% 9.75% 9.75% 9.75%
Series C preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares       $ 0.503125 $ 0.503125    
Preferred stock, dividend rate (as percent)       8.05% 8.05% 8.05% 8.05%
Series D preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares       $ 0.523438 $ 0.523438    
Preferred stock, dividend rate (as percent)       8.375% 8.375% 8.375% 8.375%
Subsequent event              
Subsequent Event [Line Items]              
Dividends declared $ 1,400            
Subsequent event | Series B preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares $ 0.609375            
Preferred stock, dividend rate (as percent) 9.75%            
Subsequent event | Series C preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares $ 0.503125            
Preferred stock, dividend rate (as percent) 8.05%            
Subsequent event | Series D preferred stock              
Subsequent Event [Line Items]              
Dividends declared per share of preferred stock (in dollars per share) | $ / shares $ 0.523438            
Preferred stock, dividend rate (as percent) 8.375%            
Subsequent event | Disposed by sale | Georgia Private Golf Property              
Subsequent Event [Line Items]              
Proceeds from sale of property   $ 3,500          
Carrying value of property sold   3,000          
Gain on sale of property   $ 500          
Subsequent event | Lease Termination Dispute              
Subsequent Event [Line Items]              
Settlement awarded     $ 7,400        
Amount of settlement payable immediately     5,200        
Amount of settlement payable due by December 2019     $ 2,200        
Number of quarterly payment installments | installment     6