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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets |  |
Cash and Cash Equivalents | $ 156,832 | $ 316,264
Investments—Consolidated Investment Companies |  |
Equity Securities | 1,902 | 6,170
Debt Securities | 20,896 | 39,241
Investments—Affiliates and Other |  |
Equity Securities | 7,404 | 4,866
Debt Securities | 3,456 | 2,997
Other | 667 | 1,240
Total Financial Assets | 191,157 | 370,778
Total Financial Liabilities | 4,290 | 1,203
Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 156,832 | 205,364
Investments—Consolidated Investment Companies |  |
Equity Securities | 1,269 | 5,424
Debt Securities | 0 | 0
Investments—Affiliates and Other |  |
Equity Securities | 6,684 | 4,564
Debt Securities | 0 | 0
Other | 597 | 123
Total Financial Assets | 165,382 | 215,475
Total Financial Liabilities | 53 | 0
Level 2 |  |
Financial Assets |  |
Cash and Cash Equivalents | 0 | 0
Investments—Consolidated Investment Companies |  |
Equity Securities | 633 | 746
Debt Securities | 20,896 | 39,241
Investments—Affiliates and Other |  |
Equity Securities | 403 | 0
Debt Securities | 3,456 | 2,997
Other | 0 | 357
Total Financial Assets | 25,388 | 43,341
Total Financial Liabilities | 3,852 | 0
Level 3 |  |
Financial Assets |  |
Cash and Cash Equivalents | 0 | 0
Investments—Consolidated Investment Companies |  |
Equity Securities | 0 | 0
Debt Securities | 0 | 0
Investments—Affiliates and Other |  |
Equity Securities | 38 | 0
Debt Securities | 0 | 0
Other | 70 | 760
Total Financial Assets | 108 | 760
Total Financial Liabilities | 385 | 1,203
NAV Practical Expedient |  |
Financial Assets |  |
Cash and Cash Equivalents |  | 110,900
Investments—Affiliates and Other |  |
Equity Securities | 279 | 302
Total Financial Assets | $ 279 | $ 111,202

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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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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