Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($) Property		Dec. 31, 2021 USD ($) Property		Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Property
Property, Plant and Equipment [Line Items]
Number of properties under development | Property		2		2			3
Real estate under development, beginning balance		$ 192,115		$ 203,773		$ 203,773	$ 247,201
Transfers In		0		29,758
Capitalized Costs		1,193		8,994
Transfers Out		$ (12,851)		$ (82,180)
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of properties under development | Property		0		0			0
Real estate under development, beginning balance		$ 42,975		$ 42,517			$ 63,875
Transfers In		0		0
Capitalized Costs		458		1,855
Transfers Out		$ 0		$ (23,213)
Fund Portfolio | Fund II
Property, Plant and Equipment [Line Items]
Number of properties under development | Property		0		0			0
Real estate under development, beginning balance		$ 35,502		$ 35,125			$ 74,657
Transfers In		0		0
Capitalized Costs		377		3,921
Transfers Out		$ 0		$ (43,453)
Fund Portfolio | Fund III
Property, Plant and Equipment [Line Items]
Number of properties under development | Property		1		1			1
Real estate under development, beginning balance		$ 24,578		$ 24,296			$ 23,104
Transfers In		0		0
Capitalized Costs		282		1,192
Transfers Out		$ 0		$ 0
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of properties under development | Property		1	[1]	1	[1],[2]		2	[2]
Real estate under development, beginning balance		$ 89,060	[1]	$ 101,835	[1],[2]		$ 85,565	[2]
Transfers In	[1]	0		29,758
Capitalized Costs	[1]	76		2,026
Transfers Out		$ (12,851)	[1]	$ (15,514)	[2]

[1] Transfers out include $12.9 million related to a portion of one Fund IV property that was transferred out of development.

[2] Transfers in include $29.8 million related to the remaining portion of one Fund IV property that was placed in development.