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ACQUISITIONS - Net Assets Purchased (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Total assets | $ 5,340,853 | $ 5,704,808 |  | $ 6,104,640
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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