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Investment Securities and Certificates of Deposit (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | The Company's Investment Securities and Certificates of Deposit as of September 30, 2021 and December 31, 2020 were as follows:
| September 30, 2021 |  | December 31, 2020
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt Securities | $ | 452,955 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 452,974 |  |  | $ | 402,824 |  |  | $ | 39 |  |  | $ | — |  |  | $ | 402,863 |
Equity Securities | 666 |  |  | 376 |  |  | — |  |  | 1,042 |  |  | 666 |  |  | — |  |  | 73 |  |  | 593 |
Debt Securities Carried by Broker-Dealers | 564,837 |  |  | 42 |  |  | 2 |  |  | 564,877 |  |  | 550,002 |  |  | 27 |  |  | 3 |  |  | 550,026 |
Investment Funds | 110,246 |  |  | 26,310 |  |  | — |  |  | 136,556 |  |  | 87,612 |  |  | 19,742 |  |  | — |  |  | 107,354 |
Total Investment Securities (carried at fair value) | $ | 1,128,704 |  |  | $ | 26,747 |  |  | $ | 2 |  |  | $ | 1,155,449 |  |  | $ | 1,041,104 |  |  | $ | 19,808 |  |  | $ | 76 |  |  | $ | 1,060,836 |
Certificates of Deposit (carried at contract value) |  | 114,512 |  |  |  |  |  |  |  |  | — |
Total Investment Securities and Certificates of Deposit |  | $ | 1,269,961 |  |  |  |  |  |  |  |  | $ | 1,060,836 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company's available-for-sale debt securities as of September 30, 2021 and December 31, 2020 were as follows:
| September 30, 2021 |  | December 31, 2020
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 452,955 |  |  | $ | 452,974 |  |  | $ | 402,824 |  |  | $ | 402,863 |
Total | $ | 452,955 |  |  | $ | 452,974 |  |  | $ | 402,824 |  |  | $ | 402,863 |

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