Note 11 - Variable Interest Entities ("VIE") (Details Textual) $ in Thousands		Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Assets, Total	[1]	$ 11,699,703	$ 11,614,498
Liabilities, Total	[2]	$ 5,953,384	$ 5,928,460
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Number of Entities		23	22
Consolidated Operating Properties [Member]
Variable Interest Entity, Number of Entities		23	22
Consolidated Operating Properties [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Total		$ 1,100,000	$ 1,000,000
Liabilities, Total		$ 96,700	$ 62,100

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $101,947 and $102,482, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $96,660 and $62,076, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.