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Marketable Securities and Certificates of Deposit | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities and Certificates of Deposit | Marketable Securities and Certificates of Deposit The amortized cost and estimated fair value of the Company's Marketable Securities as of September 30, 2018 and December 31, 2017 were as follows:
| September 30, 2018 |  | December 31, 2017
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Investments - Debt Securities | $ | 1,298 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 1,293 |  |  | $ | 1,806 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 1,795 |
Securities Investments - Equity Securities | 666 |  |  | — |  |  | 310 |  |  | 356 |  |  | 5,388 |  |  | — |  |  | 4,144 |  |  | 1,244 |
Debt Securities Carried by EGL | 145,731 |  |  | 159 |  |  | 63 |  |  | 145,827 |  |  | 34,233 |  |  | 87 |  |  | 26 |  |  | 34,294 |
Investment Funds | 55,940 |  |  | 7,716 |  |  | 4 |  |  | 63,652 |  |  | 22,027 |  |  | 5,678 |  |  | 6 |  |  | 27,699 |
Total | $ | 203,635 |  |  | $ | 7,875 |  |  | $ | 382 |  |  | $ | 211,128 |  |  | $ | 63,454 |  |  | $ | 5,765 |  |  | $ | 4,187 |  |  | $ | 65,032 |
Scheduled maturities of the Company's available-for-sale debt securities within the Securities Investments portfolio as of September 30, 2018 and December 31, 2017 were as follows:
| September 30, 2018 |  | December 31, 2017
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 200 |  |  | $ | 200 |  |  | $ | 204 |  |  | $ | 204 |
Due after one year through five years | 999 |  |  | 995 |  |  | 1,602 |  |  | 1,591 |
Due after five years through 10 years | 99 |  |  | 98 |  |  | — |  |  | — |
Total | $ | 1,298 |  |  | $ | 1,293 |  |  | $ | 1,806 |  |  | $ | 1,795 |
Since the Company has the ability and intent to hold available-for-sale securities until a recovery of fair value is equal to an amount approximating its amortized cost, which may be at maturity, and has not incurred credit losses on its securities, it does not consider such unrealized loss positions to be other-than-temporarily impaired at September 30, 2018. Securities Investments - Debt Securities Securities Investments - Debt Securities are classified as available-for-sale securities within Marketable Securities on the Unaudited Condensed Consolidated Statements of Financial Condition. These securities are stated at fair value with unrealized gains and losses included in Accumulated Other Comprehensive Income (Loss) and realized gains and losses included in earnings. The Company had net realized gains (losses) of $9 and ($26) for the three and nine months ended September 30, 2018, respectively, and ($26) for the nine months ended September 30, 2017. Securities Investments - Equity Securities Securities Investments - Equity Securities are carried at fair value with changes in fair value recorded in Other Revenue, Including Interest and Investments, beginning on January 1, 2018, on the Unaudited Condensed Consolidated Statements of Operations. The Company had net realized and unrealized gains (losses) of $114 and ($92) for the three and nine months ended September 30, 2018, respectively, and $32 and ($43) for the three and nine months ended September 30, 2017, respectively. Debt Securities Carried by EGL EGL invests in a fixed income portfolio consisting primarily of treasury bills and municipal bonds. These securities are carried at fair value, with changes in fair value recorded in Other Revenue, Including Interest and Investments, on the Unaudited Condensed Consolidated Statements of Operations, as required for broker-dealers in securities. The Company had net realized and unrealized losses of ($207) and ($242) for the three and nine months ended September 30, 2018, respectively, and ($340) and ($707) for the three and nine months ended September 30, 2017, respectively. Investment Funds The Company invests in a portfolio of exchange-traded funds and mutual funds as an economic hedge against the Company's deferred cash compensation program. See Note 15 for further information. These securities are carried at fair value, with changes in fair value recorded in Other Revenue, Including Interest and Investments, on the Unaudited Condensed Consolidated Statements of Operations. The Company had net realized and unrealized gains of $3,004 and $4,120 for the three and nine months ended September 30, 2018, respectively, and $1,013 and $2,570 for the three and nine months ended September 30, 2017, respectively. Certificates of Deposit At September 30, 2018, the Company held certificates of deposit of $100,000 with a bank with original maturities of six months or less when purchased. At December 31, 2017, the Company held certificates of deposit of $63,527 with certain banks with original maturities of six months or less when purchased, which matured during the first quarter of 2018.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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