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REAL ESTATE - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
property
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
property
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]          
Real estate acquired in settlement of residential mortgage loans $ 0   $ 0   $ 0
Number of commercial real estate acquired (property) | property 0 0 0 0  
Number of wholly owned real estate properties sold (property) | property       1  
Proceeds from sale of wholly-owned triple net leased properties       $ 12,000,000  
Gain on sale of wholly-owned triple net leased properties       5,100,000  
Weighted average amortization period for intangible assets and liabilities     5 years 9 days    
General and Administrative Expense          
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 4,500,000 $ 4,000,000 $ 11,900,000 $ 11,800,000