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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) property	Dec. 31, 2018 USD ($) property
Property, Plant and Equipment [Line Items]
Number of properties under development | property	5	3
Real estate under development	$ 211,199	$ 120,297
Transfers In	78,821
Capitalized Costs	12,081
Transfers Out	$ 0
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of properties under development | property	2	1
Real estate under development	$ 70,483	$ 7,759
Transfers In	57,342
Capitalized Costs	5,382
Transfers Out	$ 0
Fund Portfolio | Fund II
Property, Plant and Equipment [Line Items]
Number of properties under development | property	0	0
Real estate under development	$ 8,716	$ 7,462
Transfers In	0
Capitalized Costs	1,254
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	$ 35,001	$ 21,242
Transfers In	12,313
Capitalized Costs	1,446
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	$ 96,999	$ 83,834
Transfers In	9,166
Capitalized Costs	3,999
Transfers Out	$ 0

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- Definition

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

+ References

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=6879938&loc=d3e572229-122910

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