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Note 2 - Real Estate - Components of Rental Property (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Land		$ 3,019,284	$ 2,845,186
Buildings and improvements:
Buildings and improvements		9,231,644	8,827,861
Above-market leases		153,484	150,207
In-place leases and tenant relationships		577,870	543,342
		12,250,928	11,673,047
Accumulated depreciation and amortization (1)	[1]	(2,433,053)	(2,278,292)
Real Estate Investment Property, Net		9,817,875	9,394,755
Land [Member]
Land		2,971,020	2,786,255
Undeveloped Land [Member]
Land		48,264	58,931
Building [Member]
Buildings and improvements:
Buildings and improvements		6,047,413	5,790,681
Building Improvements [Member]
Buildings and improvements:
Buildings and improvements		1,653,581	1,562,439
Tenant Improvements [Member]
Buildings and improvements:
Buildings and improvements		753,501	733,993
Fixtures And Leasehold Improvements [Member]
Buildings and improvements:
Buildings and improvements		$ 45,795	$ 47,199
[1] At December 31, 2017 and 2016, the Company had accumulated amortization relating to in-place leases, tenant relationships and above-market leases aggregating $459,211 and $409,062, respectively.

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This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

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This element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

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-Publisher FASB
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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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Amount of real estate investment property, net of accumulated depreciation, 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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