Note 6 - Investment and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Total real estate, net		$ 15,094,925	$ 15,039,828
Other assets, net		241,948	253,779
Assets	[1]	18,274,022	17,826,122
Notes payable, net		7,262,851	6,780,969
Secured Debt		353,945	376,917
Other Liabilities		599,961	601,574
Accumulated other comprehensive income		3,329	10,581
Members’ capital		9,525,465	9,515,508
Total Liabilities and Members’ Capital		18,274,022	17,826,122
Equity, Attributable to Noncontrolling Interest		127,993	131,401
KIR [Member]
Total real estate, net		669,200	668,700
Other assets, net		67,500	72,400
Assets		736,700	741,100
Notes payable, net		273,400	272,900
Secured Debt		0	25,000
Other Liabilities		15,900	13,900
Accumulated other comprehensive income		600	0
Members’ capital		446,800	429,300
Total Liabilities and Members’ Capital		736,700	741,100
Excluding KIR [Member]
Total real estate, net		3,156,200	3,440,100
Other assets, net		251,600	208,400
Assets		3,407,800	3,648,500
Notes payable, net		159,900	159,500
Secured Debt		815,600	925,900
Other Liabilities		70,900	78,800
Accumulated other comprehensive income		5,100	6,300
Members’ capital		2,321,900	2,444,500
Total Liabilities and Members’ Capital		3,407,800	3,648,500
Equity, Attributable to Noncontrolling Interest		$ 34,400	$ 33,500

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at December 31, 2023 and 2022 of $388,620 and $436,605, respectively. See Footnote 16 of the Notes to Consolidated Financial Statements.