Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of net assets (liabilities).

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Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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ACQUISITIONS (2017 Summary of Net Assets Purchased) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Total assets	$ 5,704,808		$ 6,104,640	$ 6,479,991
Total
Business Acquisition [Line Items]
Land		$ 49,663
Buildings and improvements		16,779
Tenant improvements		4,611
Total assets		80,677
Below-market leases		(878)
Net assets acquired		79,799
Sears Stores
Business Acquisition [Line Items]
Land		45,028
Buildings and improvements		14,814
Tenant improvements		4,234
Total assets		73,121
Below-market leases		(356)
Net assets acquired		72,765
Macy's Stores
Business Acquisition [Line Items]
Land		4,635
Buildings and improvements		1,965
Tenant improvements		377
Total assets		7,556
Below-market leases		(522)
Net assets acquired		7,034
Above-market leases \| Total
Business Acquisition [Line Items]
In-place leases		681
Above-market leases \| Sears Stores
Business Acquisition [Line Items]
In-place leases		681
Above-market leases \| Macy's Stores
Business Acquisition [Line Items]
In-place leases		0
In-place leases \| Total
Business Acquisition [Line Items]
In-place leases		8,943
In-place leases \| Sears Stores
Business Acquisition [Line Items]
In-place leases		8,364
In-place leases \| Macy's Stores
Business Acquisition [Line Items]
In-place leases		$ 579