Note 10 - Variable Interest Entities ("VIE") - Summary of Restricted Assets and VIE Liabilities (Details) $ in Thousands		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Real estate, net of accumulated depreciation and amortization of $2,552,669 and $2,500,053, respectively		$ 9,179,554	$ 9,209,053
Cash and cash equivalents		451,796	123,947
Accounts and notes receivable, net		220,215	218,689
Other assets		361,193	354,365
Assets, Total	[1]	11,305,134	10,997,867
Mortgages and construction loan payable, net		404,879	484,008
Other liabilities		488,168	516,265
Liabilities, Total	[2]	$ 6,414,722	$ 6,051,017
Variable Interest Entity, Unencumbered [Member]
Number of consolidated VIEs		19	19
Variable Interest Entity, Encumbered by Third Party Non-resource Mortgage Debt [Member]
Number of consolidated VIEs		3	4
Variable Interest Entity, Primary Beneficiary [Member]
Number of consolidated VIEs		22	23
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Mortgages and construction loan payable, net		$ 37,600	$ 104,500
Other liabilities		27,900	48,900
Liabilities, Total		65,500	153,400
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]
Real estate, net of accumulated depreciation and amortization of $2,552,669 and $2,500,053, respectively		99,100	228,900
Cash and cash equivalents		1,600	9,200
Accounts and notes receivable, net		2,000	3,800
Other assets		1,500	3,600
Assets, Total		$ 104,200	$ 245,500

[1] Includes restricted assets of consolidated variable interest entities ("VIEs") at March 31, 2020 and December 31, 2019 of $104,243 and $245,489, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at March 31, 2020 and December 31, 2019 of $65,544 and $153,436, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.