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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Real Estate Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Net amortization expense of acquired intangibles $ 13,282 $ 13,256 $ 8,687
Future amortization expense, 2019 4,455    
Future amortization expense, 2020 1,568    
Future amortization expense, 2021 1,292    
Future amortization expense, 2022 1,153    
Future amortization expense, 2023 928    
Interest expense capitalized 3,225 2,314 $ 2,182
Intangible lease assets and other assets | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 28,165 38,798  
Intangible lease assets and liabilities, Accumulated Amortization (24,890) (31,245)  
Intangible lease assets and other assets | In-place leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 92,750 103,230  
Intangible lease assets and liabilities, Accumulated Amortization (78,796) (78,854)  
Intangible lease assets and other assets | Tenant relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 41,561 44,580  
Intangible lease assets and liabilities, Accumulated Amortization (10,135) (9,719)  
Accounts payable and accrued liabilities | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 63,719 69,990  
Intangible lease assets and liabilities, Accumulated Amortization $ (50,146) $ (49,756)  
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