SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Real Estate Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Net amortization expense of acquired intangibles	$ 8,687	$ 12,939	$ 13,973
Future amortization expense, 2017	6,378
Future amortization expense, 2018	3,589
Future amortization expense, 2019	2,502
Future amortization expense, 2020	1,923
Future amortization expense, 2021	1,882
Interest expense capitalized	2,182	3,697	$ 7,122
Intangible lease assets and other assets | Above-market/Below-market leases
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets and liabilities, Cost	49,310	54,080
Intangible lease assets and liabilities, Accumulated Amortization	(38,197)	(39,228)
Intangible lease assets and other assets | In-place leases
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets and liabilities, Cost	110,968	113,335
Intangible lease assets and liabilities, Accumulated Amortization	(80,256)	(71,460)
Intangible lease assets and other assets | Tenant relationships
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets and liabilities, Cost	29,494	29,742
Intangible lease assets and liabilities, Accumulated Amortization	(6,610)	(5,868)
Accounts payable and accrued liabilities | Above-market/Below-market leases
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets and liabilities, Cost	87,266	89,182
Intangible lease assets and liabilities, Accumulated Amortization	$ (60,286)	$ (54,999)
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