Note 10 - Variable Interest Entities ("VIE") - Summary of Restricted Assets and VIE Liabilities (Details) $ in Thousands		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Real estate, net		$ 9,346,041	$ 9,209,053
Cash and cash equivalents		293,188	123,947
Accounts and notes receivable, net		219,248	218,689
Other Assets, Total		97,225	194,682
Assets, Total	[1]	11,614,498	10,997,867
Secured Debt, Total		311,272	484,008
Accounts payable and accrued expenses		146,457	170,082
Operating Lease, Liability, Total		96,619	92,711
Other Liabilities, Total		324,538	346,183
Liabilities, Total	[2]	$ 5,928,460	$ 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]
Secured Debt, Total		$ 36,500	$ 104,500
Accounts payable and accrued expenses		5,200	7,100
Operating Lease, Liability, Total		5,500	5,600
Other Liabilities, Total		14,900	36,200
Liabilities, Total		62,100	153,400
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]
Real estate, net		97,700	228,900
Cash and cash equivalents		1,800	9,200
Accounts and notes receivable, net		1,900	3,800
Other Assets, Total		1,100	3,600
Assets, Total		$ 102,500	$ 245,500

[1] Includes restricted assets of consolidated variable interest entities ("VIEs") at December 31, 2020 and December 31, 2019 of $102,482 and $245,489, respectively. See Footnote 10 of the Notes to Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at December 31, 2020 and December 31, 2019 of $62,076 and $153,436, respectively. See Footnote 10 of the Notes to Consolidated Financial Statements.