Segment Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment				3
Number of operating segments | segment				3
Net operating income		$ 286,819	$ 245,281	$ 833,655	$ 728,965
Corporate-level property management expenses		(10,184)	(9,060)	(30,532)	(27,135)
Depreciation and amortization		(135,511)	(130,564)	(403,561)	(387,887)
General and administrative		(15,172)	(12,712)	(40,541)	(34,746)
Expensed acquisition and investment related costs		(230)	(108)	(248)	(164)
Gain on sale of real estate and land		0	42,897	0	142,993
Interest expense		(51,645)	(50,019)	(152,499)	(152,639)
Total return swap income		1,882	2,660	6,709	8,137
Interest and other (loss) income		(6,796)	11,998	(31,571)	48,756
Equity income from co-investments		10,985	25,433	23,756	60,692
Deferred tax (expense) benefit on unconsolidated co-investments		(1,755)	(3,041)	7,863	(5,391)
Loss on early retirement of debt, net		(2)	0	(2)	(18,982)
Gain on remeasurement of co-investment	$ 17,400	17,423	0	17,423	2,260
Net income		98,700	125,002	238,765	371,566
Net reportable operating segment - real estate assets		10,923,725		10,923,725		$ 10,983,073
Real estate under development		23,752		23,752		111,562
Co-investments		1,145,345		1,145,345		1,177,802
Cash and cash equivalents, including restricted cash		53,569	60,952	53,569	60,952	58,638	$ 84,041
Marketable securities		141,699		141,699		191,829
Notes and other receivables		197,543		197,543		341,033
Operating lease right-of-use assets		66,531		66,531		68,972
Prepaid expenses and other assets		72,166		72,166		64,964
Total assets		12,624,330		12,624,330		12,997,873
Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		406,862	360,620	1,183,318	1,062,253
Management and Other Fees From Affiliates Income
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		2,886	2,237	8,313	6,707
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income		119,655	103,656	347,535	300,766
Net reportable operating segment - real estate assets		3,993,289		3,993,289		4,018,839
Operating Segments | Southern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		168,883	150,807	490,363	434,926
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income		113,401	98,944	331,466	299,494
Net reportable operating segment - real estate assets		5,444,582		5,444,582		5,460,701
Operating Segments | Northern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		163,157	145,807	476,245	435,883
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income		48,816	39,875	141,380	119,044
Net reportable operating segment - real estate assets		1,381,428		1,381,428		1,407,033
Operating Segments | Seattle Metro | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		69,054	60,280	200,964	178,180
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income		4,947	2,806	13,274	9,661
Net reportable operating segment - real estate assets		104,426		104,426		$ 96,500
Other real estate assets | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues		$ 5,768	$ 3,726	$ 15,746	$ 13,264