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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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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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- Definition [Line Items] for Fair Value Measurements, Nonrecurring [Table] + References No definition available. + Details
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- Definition 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 + Details
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