Note 11 - Variable Interest Entities ("VIE") (Details Textual) $ in Thousands		Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Assets, Total	[1]	$ 18,543,581	$ 18,459,199
Liabilities, Total	[2]	$ 8,314,939	$ 8,335,537
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Number of Entities		33	34
Consolidated Operating Properties [Member]
Variable Interest Entity, Number of Entities		33	34
Consolidated Operating Properties [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Total		$ 1,600,000	$ 1,600,000
Liabilities, Total		$ 152,000	$ 153,900

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2022 and December 31, 2021 of $227,748 and $227,858, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at March 31, 2022 and December 31, 2021 of $151,955 and $153,924, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.