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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets |  |
Cash and Cash Equivalents | $ 134,485 | $ 156,832
Investments—Consolidated Investment Companies |  |
Equity Securities | 1,739 | 1,902
Debt Securities | 13,854 | 20,896
Investments—Affiliates and Other |  |
Equity Securities | 8,205 | 7,404
Debt Securities | 3,828 | 3,456
Other | 697 | 667
Total Financial Assets | 162,808 | 191,157
Total Financial Liabilities | 1,367 | 4,290
Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 134,485 | 156,832
Investments—Consolidated Investment Companies |  |
Equity Securities | 1,018 | 1,269
Debt Securities | 0 | 0
Investments—Affiliates and Other |  |
Equity Securities | 7,697 | 6,684
Debt Securities | 0 | 0
Other | 627 | 597
Total Financial Assets | 143,827 | 165,382
Total Financial Liabilities | 14 | 53
Level 2 |  |
Financial Assets |  |
Cash and Cash Equivalents | 0 | 0
Investments—Consolidated Investment Companies |  |
Equity Securities | 721 | 633
Debt Securities | 13,854 | 20,896
Investments—Affiliates and Other |  |
Equity Securities | 120 | 403
Debt Securities | 3,527 | 3,456
Other | 0 | 0
Total Financial Assets | 18,222 | 25,388
Total Financial Liabilities | 782 | 3,852
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 | 41 | 38
Debt Securities | 301 | 0
Other | 70 | 70
Total Financial Assets | 412 | 108
Total Financial Liabilities | 571 | 385
NAV Practical Expedient |  |
Investments—Affiliates and Other |  |
Equity Securities | 347 | 279
Total Financial Assets | $ 347 | $ 279

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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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