Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Property		Dec. 31, 2020 USD ($) Property		Dec. 31, 2019 USD ($) Property
Property, Plant and Equipment [Line Items]
Number of properties under development | Property	2		3		3
Real estate under development, beginning balance	$ 203,773		$ 247,201		$ 253,396
Transfers In	29,758		66,812
Capitalized Costs	8,994		7,920
Transfers Out	$ 82,180		$ (80,927)
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of properties under development | Property	0		0		0
Real estate under development, beginning balance	$ 42,517		$ 63,875		$ 60,863
Transfers In	0		0
Capitalized Costs	1,855		3,012
Transfers Out	$ 23,213		$ 0
Fund Portfolio | Fund II
Property, Plant and Equipment [Line Items]
Number of properties under development | Property	0		0	[1]	0	[1]
Real estate under development, beginning balance	$ 35,125		$ 74,657	[1]	$ 10,703	[1]
Transfers In	0		66,812	[1]
Capitalized Costs	3,921		3,612	[1]
Transfers Out	$ (43,453)		$ 6,470	[1]
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	$ 24,296		$ 23,104		$ 36,240
Transfers In	0		0
Capitalized Costs	1,192		35
Transfers Out	$ 0		$ (13,171)
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of properties under development | Property	1	[2]	2	[2],[3]	2	[3]
Real estate under development, beginning balance	$ 101,835	[2]	$ 85,565	[2],[3]	$ 145,590	[3]
Transfers In	29,758	[2]	0	[3]
Capitalized Costs	2,026	[2]	1,261	[3]
Transfers Out	$ 15,514	[2]	$ (61,286)	[3]

[1] Transfers in include $33.8 million of non-cash Fund II additions obtained through the conversion of a note receivable (Note 4).

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

[3] Transfers out include impairment charges totaling $16.5 million on two Fund IV development properties (Note 9).