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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure	$ 257,717	$ 97,852
Level III [Member]
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 0
Institutional Asset Management [Member] | Level III [Member]
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure			$ 14,401
G5 [Member] | Equity Method Investments [Member] | Level III [Member]
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure			$ 11,555

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[Line Items] for Fair Value Measurements, Nonrecurring [Table]

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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