JOINT VENTURES AND PARTNERSHIPS - Unconsolidated joint ventures and partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financial information relating to unconsolidated joint ventures operations
Total revenues	$ 369,167	$ 311,348	$ 726,433	$ 612,789
Property operating expenses	60,405	51,335	118,889	102,716
Real estate depreciation and amortization	167,584	146,169	331,206	290,257
Gain/(loss) on sale of real estate	0	0	0	50,829
Operating income	50,736	35,787	98,626	110,857
Interest expense	(36,832)	(35,404)	(72,748)	(113,560)
Other income/(loss)	3,001	2,536	561	4,593
Net income/(loss)	5,364	12,535	19,967	15,809
Combined summary of balance sheets relating to unconsolidated joint ventures
Total real estate, net	9,828,365		9,828,365			$ 9,603,707
Investments, at fair value	691,864		691,864			702,461
Cash and cash equivalents	921	3,370	921	3,370		967		$ 1,409
Other Assets	214,765		214,765			216,311
Total assets	10,996,986		10,996,986			10,775,220
Accounts payable, accrued expenses, and other liabilities	137,095		137,095			136,954
Total liabilities	6,114,187		6,114,187			6,001,474
Total equity	3,869,634	2,805,173	3,869,634	2,805,173	$ 3,392,883	3,474,304	$ 3,016,401	$ 3,258,591
Unconsolidated Joint Ventures
Financial information relating to unconsolidated joint ventures operations
Total revenues	35,189	32,006	72,358	64,143
Property operating expenses	16,549	16,745	34,479	33,855
Real estate depreciation and amortization	16,636	16,144	34,456	32,597
Gain/(loss) on sale of real estate			127,542	34,757
Operating income	2,004	(883)	130,965	32,448
Interest expense	(8,637)	(7,460)	(16,769)	(19,594)
Other income/(loss)	(175)	(14)	(399)	(1,671)
Net realized/unrealized gain/(loss) on held investments	70,318	83	76,622	2,577
Net realized gain/(loss) on held investments	(217,149)	38,267	(238,641)	44,261
Net income/(loss)	(153,639)	$ 29,993	(48,222)	$ 58,021
Combined summary of balance sheets relating to unconsolidated joint ventures
Total real estate, net	2,258,126		2,258,126			2,043,158
Investments, at fair value	253,753		253,753			460,241
Real estate assets held for sale						168,668
Cash and cash equivalents	37,810		37,810			22,891
Other Assets	122,422		122,422			28,948
Total assets	2,672,111		2,672,111			2,723,906
Third party debt, net	1,296,626		1,296,626			1,215,918
Liabilities held for sale						106,990
Accounts payable, accrued expenses, and other liabilities	163,613		163,613			51,689
Total liabilities	1,460,239		1,460,239			1,374,597
Total equity	$ 1,211,872		$ 1,211,872			$ 1,349,309