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Marketable Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 30, 2019 | Dec. 31, 2018
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 14,815 |
Margin Deposit Assets |  |  |  |  | $ 680 |
Derivative, Gain (Loss) on Derivative, Net | $ 59 |  | $ 59 |  |  |
Certificates of Deposit, at Carrying Value |  |  |  |  |  | $ 100,000
Securities Investments - Debt Securities [Member] |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized Gains (Losses) | (3) | $ (22) | (6) | $ (35) |  |
Securities Investments - Equity Securities [Member] |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized and Unrealized Gains (Losses) | 41 | (54) | 193 | (65) |  |
Debt Securities Carried by EGL [Member] |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized and Unrealized Gains (Losses) | 465 | (136) | 514 | (36) |  |
Investment Funds [Member] |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized and Unrealized Gains (Losses) | $ 2,112 | $ 1,304 | $ 8,699 | $ 1,116 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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