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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Real Estate Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Net amortization expense of acquired intangibles $ 13,256 $ 8,687 $ 12,939
Future amortization expense, 2018 9,093    
Future amortization expense, 2019 4,154    
Future amortization expense, 2020 1,926    
Future amortization expense, 2021 1,712    
Future amortization expense, 2022 1,572    
Interest expense capitalized 2,314 2,182 $ 3,697
Intangible lease assets and other assets | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 38,798 49,310  
Intangible lease assets and liabilities, Accumulated Amortization (31,245) (38,197)  
Intangible lease assets and other assets | In-place leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 103,230 110,968  
Intangible lease assets and liabilities, Accumulated Amortization (78,854) (80,256)  
Intangible lease assets and other assets | Tenant relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 44,580 29,494  
Intangible lease assets and liabilities, Accumulated Amortization (9,719) (6,610)  
Accounts payable and accrued liabilities | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 69,990 87,266  
Intangible lease assets and liabilities, Accumulated Amortization $ (49,756) $ (60,286)  
Buildings      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 40 years    
Certain Improvements | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 10 years    
Certain Improvements | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 20 years    
Equipment and Fixtures | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 7 years    
Equipment and Fixtures | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 10 years