Note 11 - Variable Interest Entities ("VIE") (Details Textual) $ in Thousands		Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Assets, Total	[1]	$ 11,558,922	$ 11,614,498
Liabilities, Total	[2]	$ 5,770,923	$ 5,928,460
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Number of Entities		22	22
Consolidated Operating Properties [Member]
Variable Interest Entity, Number of Entities		22	22
Consolidated Operating Properties [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Total		$ 991,900	$ 1,000,000
Liabilities, Total		$ 60,700	$ 62,100

[1] Includes restricted assets of consolidated variable interest entities ("VIEs") at June 30, 2021 and December 31, 2020 of $101,807 and $102,482, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at June 30, 2021 and December 31, 2020 of $60,723 and $62,076, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.