TENANT ORIGINATION AND ABSORPTION COSTS, ABOVE-MARKET LEASE ASSETS AND BELOW-MARKET LEASE LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Line Items]
Amortization expense	$ 34,004	$ 35,006	$ 53,446
Depreciation and amortization	34,004	35,006	53,446
Prepaid expenses and other assets
Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Line Items]
Tax abatement intangible assets	1,000	1,600
Property tax abatement intangible assets
Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Line Items]
Amortization expense	600	1,000	1,000
Depreciation and amortization	$ 600	$ 1,000	$ 1,000
Remaining amortization period	1 year 8 months 12 days