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Note 2 - Real Estate - Components of Rental Property (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Land |  | $ 2,781,888 | $ 2,788,155
Buildings and improvements |  | 9,281,267 | 8,920,951
Real estate |  | 12,063,155 | 11,709,106
Accumulated depreciation and amortization (1) | [1] | (2,717,114) | (2,500,053)
Real Estate Investment Property, Net, Total |  | 9,346,041 | 9,209,053
Land [Member] |  |  |
Land |  | 2,758,936 | 2,759,232
Undeveloped Land [Member] |  |  |
Land |  | 22,952 | 28,923
Building [Member] |  |  |
Buildings and improvements |  | 5,911,602 | 5,661,306
Building Improvements [Member] |  |  |
Buildings and improvements |  | 1,918,641 | 1,840,580
Tenant Improvements [Member] |  |  |
Buildings and improvements |  | 820,027 | 771,498
Fixtures And Leasehold Improvements [Member] |  |  |
Buildings and improvements |  | 32,123 | 31,563
Above Market Leases [Member] |  |  |
Buildings and improvements |  | 125,858 | 128,854
In-place Leases [Member] |  |  |
Buildings and improvements |  | $ 473,016 | $ 487,150
[1] | At December 31, 2020 and 2019, the Company had accumulated amortization relating to in-place leases and above-market leases aggregating $499,022 and $485,040, respectively.

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- Definition Amount before accumulated depletion of real estate held for productive use, excluding land held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 + Details
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