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Marketable Securities and Certificates of Deposit (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019 and December 31, 2018 were as follows:
| March 31, 2019 |  | December 31, 2018
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Investments - Debt Securities | $ | 1,836 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 1,858 |  |  | $ | 1,622 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 1,632 |
Securities Investments - Equity Securities | 666 |  |  | — |  |  | 259 |  |  | 407 |  |  | 666 |  |  | — |  |  | 410 |  |  | 256 |
Debt Securities Carried by EGL | 145,349 |  |  | 1,055 |  |  | 2 |  |  | 146,402 |  |  | 147,009 |  |  | 954 |  |  | — |  |  | 147,963 |
Investment Funds | 62,906 |  |  | 2,056 |  |  | 146 |  |  | 64,816 |  |  | 56,296 |  |  | 402 |  |  | 1,922 |  |  | 54,776 |
Total | $ | 210,757 |  |  | $ | 3,133 |  |  | $ | 407 |  |  | $ | 213,483 |  |  | $ | 205,593 |  |  | $ | 1,366 |  |  | $ | 2,332 |  |  | $ | 204,627 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company's available-for-sale debt securities within the Securities Investments portfolio as of March 31, 2019 and December 31, 2018 were as follows:
| March 31, 2019 |  | December 31, 2018
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 489 |  |  | $ | 490 |  |  | $ | 391 |  |  | $ | 391 |
Due after one year through five years | 1,347 |  |  | 1,368 |  |  | 1,231 |  |  | 1,241 |
Total | $ | 1,836 |  |  | $ | 1,858 |  |  | $ | 1,622 |  |  | $ | 1,632 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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