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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 |  |

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