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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) property	Dec. 31, 2018 USD ($) property
Property, Plant and Equipment [Line Items]
Number of properties under development | property	4	3
Real estate under development, beginning balance	$ 250,278	$ 120,297
Transfers In	116,821
Capitalized Costs	22,979
Transfers Out	$ 9,819
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of properties under development | property	1	1
Real estate under development, beginning balance	$ 64,945	$ 7,759
Transfers In	57,342
Capitalized Costs	9,663
Transfers Out	$ 9,819
Fund Portfolio | Fund II
Property, Plant and Equipment [Line Items]
Number of properties under development | property	0	0
Real estate under development, beginning balance	$ 9,088	$ 7,462
Transfers In	0
Capitalized Costs	1,626
Transfers Out	$ 0
Fund Portfolio | Fund III
Property, Plant and Equipment [Line Items]
Number of properties under development | property	1	1
Real estate under development, beginning balance	$ 35,524	$ 21,242
Transfers In	12,313
Capitalized Costs	1,969
Transfers Out	$ 0
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of properties under development | property	2	1
Real estate under development, beginning balance	$ 140,721	$ 83,834
Transfers In	47,166
Capitalized Costs	9,721
Transfers Out	$ 0

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The current amount of expenditures for a real estate project that has not yet been completed.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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