Note 7 - Investment and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Revenues, net	$ 1,364,585	$ 1,057,893	$ 1,158,884
Operating expenses	(971,140)	(731,765)	(760,515)
Depreciation and amortization	(395,320)	(288,955)	(277,879)
Interest expense	(204,133)	(186,904)	(177,395)
Other expense, net	19,810	4,119	10,985
Net income	844,059	1,000,833	410,605
Impairment charges	(3,597)	(6,624)	(48,743)
Net income	849,696	1,002,877	413,561
KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues, net	186,600		193,600	$ 173,900
Operating expenses	(51,300)		(51,000)	(49,500)
Depreciation and amortization	(40,300)		(38,000)	(36,900)
Gain on sale of properties	0		32,200	0
Interest expense	(18,100)		(28,200)	(23,800)
Other expense, net	(2,100)		(1,100)	(1,600)
Net income	74,800		107,500	$ 62,100
Excluding KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues, net	340,300	282,400	317,600
Operating expenses	(111,700)	(101,900)	(99,400)
Depreciation and amortization	(97,200)	(75,000)	(76,900)
Gain on sale of properties	61,500	200	15,000
Interest expense	(27,600)	(31,200)	(47,100)
Other expense, net	(900)	(10,800)	(14,200)
Impairment charges	(23,500)	(4,400)	(39,500)
Net income	$ 140,900	$ 59,300	$ 55,500