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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Real Estate Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Net amortization expense of acquired intangibles $ 12,939 $ 13,973 $ 19,030
Future amortization expense, 2016 8,204    
Future amortization expense, 2017 6,439    
Future amortization expense, 2018 3,593    
Future amortization expense, 2019 2,504    
Future amortization expense, 2020 1,924    
Interest expense capitalized 3,697 7,122 $ 4,889
Intangible lease assets and other assets | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 54,080 64,696  
Intangible lease assets and liabilities, Accumulated Amortization (39,228) (45,662)  
Intangible lease assets and other assets | In-place leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 113,335 110,211  
Intangible lease assets and liabilities, Accumulated Amortization (71,460) (71,272)  
Intangible lease assets and other assets | Tenant relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 29,742 29,664  
Intangible lease assets and liabilities, Accumulated Amortization (5,868) (4,917)  
Accounts payable and accrued liabilities | Above-market/Below-market leases      
Finite-Lived Intangible Assets [Line Items]      
Intangible lease assets and liabilities, Cost 89,182 99,189  
Intangible lease assets and liabilities, Accumulated Amortization $ (54,999) $ (68,127)  
Buildings      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (years) 40 years    
Certain Improvements | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (years) 10 years    
Certain Improvements | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (years) 20 years    
Equipment and Fixtures | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (years) 7 years    
Equipment and Fixtures | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (years) 10 years