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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

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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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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