Note 2 - Real Estate - Components of Rental Property (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Land		$ 4,177,797	$ 4,124,542
Buildings and improvements		14,759,997	14,332,700
Real estate		18,937,794	18,457,242
Accumulated depreciation and amortization (1)	[1]	(3,842,869)	(3,417,414)
Total real estate, net		15,094,925	15,039,828
Land [Member]
Land		4,166,475	4,102,542
Undeveloped Land [Member]
Land		5,458	16,328
Land Held for Development [Member]
Land		5,864	5,672
Building [Member]
Buildings and improvements		10,312,001	10,158,588
Building Improvements [Member]
Buildings and improvements		2,213,248	2,080,437
Tenant Improvements [Member]
Buildings and improvements		1,158,919	1,046,969
Fixtures and Leasehold Improvements [Member]
Buildings and improvements		41,055	36,627
Above Market Leases [Member]
Buildings and improvements		170,513	170,211
In-place Leases [Member]
Buildings and improvements		$ 864,261	$ 839,868

[1] At December 31, 2023 and 2022, the Company had accumulated amortization relating to in-place leases and above-market leases aggregating $751,215 and $671,794, respectively.