Note 8 - Other Real Estate Investments - Preferred Equity Investments - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Real Estate Investment Property, Net, Total		$ 9,346,041	$ 9,209,053
Other Assets, Total		97,225	194,682
Assets, Total	[1]	11,614,498	10,997,867
Secured Debt, Total		311,272	484,008
Other Liabilities, Total		324,538	346,183
Members’ capital		5,608,044	4,864,892
Total Liabilities and Members' Capital		11,614,498	10,997,867
Preferred Equity Investments [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Real Estate Investment Property, Net, Total		95,700	91,600
Other Assets, Total		216,500	484,600
Assets, Total		312,200	576,200
Secured Debt, Total		146,700	236,100
Other Liabilities, Total		4,500	2,600
Members’ capital		161,000	337,500
Total Liabilities and Members' Capital		$ 312,200	$ 576,200

[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.