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Notes Receivable, Net - Schedule of Notes Receivable (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) debtinstrument	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 109,613	$ 153,829	$ 276,163	$ 147,188
Number of instruments held | debtinstrument	5
Core Portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 56,475	101,695
Number of instruments held | debtinstrument	2
Core Portfolio | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Maturity Date	2019-04
Effective interest rate	6.00%
Core Portfolio | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Maturity Date	2020-04
Effective interest rate	8.10%
Fund Portfolio | Fund II
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 32,582	31,778
Number of instruments held | debtinstrument	1
Maturity Date	2020-05
Effective interest rate	2.50%
Fund Portfolio | Fund III
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 5,306	5,106
Number of instruments held | debtinstrument	1
Maturity Date	2020-07
Effective interest rate	18.00%
Fund Portfolio | Fund IV
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 15,250	$ 15,250
Number of instruments held | debtinstrument	1
Maturity Date	2021-02
Effective interest rate	15.30%

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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