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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Apr. 01, 2018
$ / shares
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]        
Number of operating segment | segment 1      
Origination fees received in cash $ 1,868 $ 2,680    
Accounting Standards Update 2018-07 [Member]        
Significant Accounting Policies [Line Items]        
Grant date fair value of non-vested awards | $ / shares     $ 18.10  
Assets Leased to Others [Member]        
Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 40 years      
Property, plant and equipment, depreciation method straight-line method      
Series A Preferred Stock [Member]        
Significant Accounting Policies [Line Items]        
Preferred stock offering costs $ 2,800      
Deferred offering costs 0     $ 600
Preferred stock issued 107,168     37,764
Value of shares to be issued prior to expiration of commitment period 50,000      
Cumulative Preferred Stock [Member]        
Significant Accounting Policies [Line Items]        
Amount of reduction in cumulative preferred stock $ 2,800     2,200
Development Property and Bridge Loan Investments [Member]        
Significant Accounting Policies [Line Items]        
Equity method investment, ownership percentage 49.90%      
Eight Revolving Loan Agreements [Member]        
Significant Accounting Policies [Line Items]        
Loans receivable period 3 years      
Loans outstanding $ 1,000      
Eight Revolving Loan Agreements [Member] | Minimum [Member]        
Significant Accounting Policies [Line Items]        
Interest rate on committed loans 6.90%      
Eight Revolving Loan Agreements [Member] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Interest rate on committed loans 7.00%      
Nine Revolving Loan Agreements [Member]        
Significant Accounting Policies [Line Items]        
Loans outstanding       $ 1,000