Note 16 - Fair Value Disclosure of Financial Instruments - Estimate of Fair Value Differs From Carrying Amounts (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Mortgages [Member]
Mortgages and construction loan payable, net (2)		$ 3,500	$ 7,900
Reported Value Measurement [Member]
Notes payable, net (1)	[1]	5,044,208	4,831,759
Reported Value Measurement [Member] | Mortgages [Member]
Mortgages and construction loan payable, net (2)	[2]	311,272	484,008
Estimate of Fair Value Measurement [Member]
Notes payable, net (1)	[1]	5,486,953	4,983,763
Estimate of Fair Value Measurement [Member] | Mortgages [Member]
Mortgages and construction loan payable, net (2)	[2]	$ 312,933	$ 486,042

[1] The Company determined that the valuation of its Senior Unsecured Notes were classified within Level 2 of the fair value hierarchy and its Credit Facility was classified within Level 3 of the fair value hierarchy. The estimated fair value amounts classified as Level 2 as of December 31, 2020 and 2019, were $5.5 billion and $4.8 billion, respectively. The estimated fair value amounts classified as Level 3 as of December 31, 2019, was $199.9 million.

[2] The Company determined that its valuation of these mortgages and construction loan payable was classified within Level 3 of the fair value hierarchy.