Co-investments - Combined Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Rental properties and real estate under development	$ 112,815		$ 111,562
Total assets	12,770,301		12,997,873
Debt	6,592,356		6,786,699
Other liabilities	40,705		39,969
Equity	6,138,207	$ 6,210,931	6,176,508	$ 6,183,192
Total liabilities and equity/capital	12,770,301		12,997,873
Equity Method Investment, Summarized Financial Information [Abstract]
Property revenues	381,905	355,125
Interest expense	(50,377)	(51,649)
General and administrative	(12,242)	(9,812)
Net income (loss)	78,375	176,949
Total co-investment | Affiliated Entity
Equity Method Investment, Summarized Financial Information [Abstract]
Company's share of net income	1,800	2,300
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Total co-investment
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Rental properties and real estate under development	4,666,950		4,603,465
Other assets	342,271		278,411
Total assets	5,009,221		4,881,876
Debt	3,199,607		3,046,765
Other liabilities	167,238		200,129
Equity	1,642,376		1,634,982
Total liabilities and equity/capital	5,009,221		4,881,876
Company's share of equity	1,115,696		$ 1,142,257
Equity Method Investment, Summarized Financial Information [Abstract]
Property revenues	84,600	71,759
Property operating expenses	(35,793)	(27,331)
Net operating income	48,807	44,428
Interest expense	(18,302)	(16,700)
General and administrative	(3,967)	(4,281)
Depreciation and amortization	(38,807)	(32,709)
Net income (loss)	(12,269)	(9,262)
Company's share of net income	$ 21,171	$ 17,011