Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	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	$ 283,720	$ 241,221	$ 546,836	$ 483,684
Corporate-level property management expenses	(10,176)	(9,062)	(20,348)	(18,075)
Depreciation and amortization	(134,517)	(128,736)	(268,050)	(257,323)
General and administrative	(13,127)	(12,222)	(25,369)	(22,034)
Expensed acquisition and investment related costs	(10)	(41)	(18)	(56)
Gain on sale of real estate and land	0	0	0	100,096
Interest expense	(50,477)	(50,971)	(100,854)	(102,620)
Total return swap income	2,283	2,633	4,827	5,477
Interest and other (loss) income	(17,208)	22,371	(24,775)	36,758
Equity (loss) income from co-investments	(8,400)	18,248	12,771	35,259
Deferred tax benefit (expense) on unconsolidated co-investments	6,864	(1,842)	9,618	(2,350)
Loss on early retirement of debt, net	0	(16,465)	0	(18,982)
Gain on remeasurement of co-investment	0	2,260	0	2,260
Net income (loss)	61,690	69,615	140,065	246,564
Net reportable operating segment - real estate assets	10,929,409		10,929,409		$ 10,983,073
Real estate under development	21,950		21,950		111,562
Co-investments	1,093,235		1,093,235		1,177,802
Cash and cash equivalents, including restricted cash	48,463	58,176	48,463	58,176	58,638	$ 84,041
Marketable securities	154,513		154,513		191,829
Notes and other receivables	175,345		175,345		341,033
Operating lease right-of-use assets	67,345		67,345		68,972
Prepaid expenses and other assets	67,751		67,751		64,964
Total assets	12,558,011		12,558,011		12,997,873
Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	397,240	348,757	776,456	701,633
Management and Other Fees From Affiliates Income
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	2,738	2,221	5,427	4,470
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	117,667	98,533	227,880	197,110
Net reportable operating segment - real estate assets	3,951,932		3,951,932		4,018,839
Operating Segments | Southern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	164,511	142,150	321,480	284,119
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	113,080	98,900	218,065	200,549
Net reportable operating segment - real estate assets	5,480,837		5,480,837		5,460,701
Operating Segments | Northern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	160,498	143,386	313,088	290,076
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	49,268	40,377	92,564	79,169
Net reportable operating segment - real estate assets	1,386,956		1,386,956		1,407,033
Operating Segments | Seattle Metro | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	67,707	59,267	131,910	117,900
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	3,705	3,411	8,327	6,856
Net reportable operating segment - real estate assets	109,684		109,684		$ 96,500
Other real estate assets | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 4,524	$ 3,954	$ 9,978	$ 9,538