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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Investments in Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	[1]	$ 93,841	$ 40,354
Grace Lake JV, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures		2,664	5,316
24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures		$ 91,177	$ 35,038
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
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-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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