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Marketable Securities and Certificates of Deposit (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | 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 |
Investments Classified by Contractual Maturity Date | 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 |

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