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Investment Securities and Certificates of Deposit (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | The Company's Investment Securities and Certificates of Deposit as of June 30, 2022 and December 31, 2021 were as follows:
| June 30, 2022 |  | December 31, 2021
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt Securities | $ | 462,544 |  |  | $ | 346 |  |  | $ | — |  |  | $ | 462,890 |  |  | $ | 706,826 |  |  | $ | 37 |  |  | $ | 16 |  |  | $ | 706,847 |
Equity Securities | 558 |  |  | — |  |  | 147 |  |  | 411 |  |  | 666 |  |  | 193 |  |  | — |  |  | 859 |
Debt Securities Carried by EGL | 389,290 |  |  | 570 |  |  | — |  |  | 389,860 |  |  | 784,813 |  |  | 43 |  |  | 14 |  |  | 784,842 |
Investment Funds | 143,276 |  |  | 358 |  |  | 9,658 |  |  | 133,976 |  |  | 111,682 |  |  | 39,191 |  |  | — |  |  | 150,873 |
Total Investment Securities (carried at fair value) | $ | 995,668 |  |  | $ | 1,274 |  |  | $ | 9,805 |  |  | $ | 987,137 |  |  | $ | 1,603,987 |  |  | $ | 39,464 |  |  | $ | 30 |  |  | $ | 1,643,421 |
Certificates of Deposit (carried at contract value) |  | 148,563 |  |  |  |  |  |  |  |  | 141,218 |
Total Investment Securities and Certificates of Deposit |  | $ | 1,135,700 |  |  |  |  |  |  |  |  | $ | 1,784,639 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company's available-for-sale debt securities as of June 30, 2022 and December 31, 2021 were as follows:
| June 30, 2022 |  | December 31, 2021
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 462,544 |  |  | $ | 462,890 |  |  | $ | 706,826 |  |  | $ | 706,847 |
Total | $ | 462,544 |  |  | $ | 462,890 |  |  | $ | 706,826 |  |  | $ | 706,847 |

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