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Note 2 - Real Estate - Components of Rental Property (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
land |  | $ 2,822,691 | $ 3,019,284
Buildings and improvements: |  |  |
Buildings and improvements |  | 8,813,115 | 9,231,644
Real estate |  | 11,635,806 | 12,250,928
Accumulated depreciation and amortization (1) | [1] | (2,385,287) | (2,433,053)
Real Estate Investment Property, Net, Total |  | 9,250,519 | 9,817,875
Land [Member] |  |  |
land |  | 2,783,959 | 2,971,020
Undeveloped Land [Member] |  |  |
land |  | 38,732 | 48,264
Building [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | 5,697,269 | 6,047,413
Building Improvements [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | 1,696,440 | 1,653,581
Tenant Improvements [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | 730,623 | 753,501
Fixtures And Leasehold Improvements [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | 42,635 | 45,795
Above Market Leases [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | 133,913 | 153,484
In-place Leases and Tenant Relationships [Member] |  |  |
Buildings and improvements: |  |  |
Buildings and improvements |  | $ 512,235 | $ 577,870
[1] | At December 31, 2018 and 2017, the Company had accumulated amortization relating to in-place leases, tenant relationships and above-market leases aggregating $466,576 and $459,211, respectively.

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