VARIABLE INTEREST ENTITIES - VIEs Not Consolidated (Details) - Unconsolidated VIEs - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 1,126,093	$ 1,477,519
Corporate investments
Variable Interest Entity [Line Items]
Carrying value of company's investments in VIEs, not consolidated	1,053,022	1,093,294
Due from affiliates
Variable Interest Entity [Line Items]
Carrying value of company's investments in VIEs, not consolidated	$ 73,071	$ 384,225

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant