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Investment Securities and Certificates of Deposit (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | The Company's Investment Securities and Certificates of Deposit as of September 30, 2019 and December 31, 2018 were as follows:
| September 30, 2019 |  | December 31, 2018
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt Securities | $ | 114,361 |  |  | $ | 93 |  |  | $ | — |  |  | $ | 114,454 |  |  | $ | 1,622 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 1,632 |
Equity Securities | 666 |  |  | — |  |  | 188 |  |  | 478 |  |  | 666 |  |  | — |  |  | 410 |  |  | 256 |
Debt Securities Carried by Broker-Dealers | 228,184 |  |  | 1,500 |  |  | 3 |  |  | 229,681 |  |  | 147,009 |  |  | 954 |  |  | — |  |  | 147,963 |
Investment Funds | 60,172 |  |  | 3,454 |  |  | — |  |  | 63,626 |  |  | 56,296 |  |  | 402 |  |  | 1,922 |  |  | 54,776 |
Total Investment Securities (carried at fair value) | $ | 403,383 |  |  | $ | 5,047 |  |  | $ | 191 |  |  | $ | 408,239 |  |  | $ | 205,593 |  |  | $ | 1,366 |  |  | $ | 2,332 |  |  | $ | 204,627 |
Certificates of Deposit (carried at contract value) |  | 211,861 |  |  |  |  |  |  |  |  | 100,000 |
Total Investment Securities and Certificates of Deposit |  | $ | 620,100 |  |  |  |  |  |  |  |  | $ | 304,627 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company's available-for-sale debt securities as of September 30, 2019 and December 31, 2018 were as follows:
| September 30, 2019 |  | December 31, 2018
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 112,945 |  |  | $ | 113,000 |  |  | $ | 391 |  |  | $ | 391 |
Due after one year through five years | 1,416 |  |  | 1,454 |  |  | 1,231 |  |  | 1,241 |
Total | $ | 114,361 |  |  | $ | 114,454 |  |  | $ | 1,622 |  |  | $ | 1,632 |

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