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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Carrying Amounts and Estimated Fair Values of Financial Insruments | The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2023 and 2022:
| 2023 |  | 2022
(In thousands) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Assets: |  |  |  |  |  |  |
Fixed maturity securities | $ | 20,178,308 |  |  | $ | 20,181,547 |  |  | $ | 17,587,349 |  |  | $ | 17,591,626 |
Equity securities | 1,090,347 |  |  | 1,090,347 |  |  | 1,185,894 |  |  | 1,185,894 |
Arbitrage trading account | 938,049 |  |  | 938,049 |  |  | 944,230 |  |  | 944,230 |
Loans receivable | 201,271 |  |  | 198,244 |  |  | 193,002 |  |  | 187,981 |
Cash and cash equivalents | 1,363,195 |  |  | 1,363,195 |  |  | 1,449,346 |  |  | 1,449,346 |
Trading accounts receivable from brokers and clearing organizations | 303,614 |  |  | 303,614 |  |  | 233,863 |  |  | 233,863 |
Due from broker | 36,747 |  |  | 36,747 |  |  | 3,609 |  |  | 3,609 |
Liabilities: |  |  |  |  |  |  |
Trading account securities sold but not yet purchased | 9,357 |  |  | 9,357 |  |  | — |  |  | — |
Senior notes and other debt | 1,827,951 |  |  | 1,480,076 |  |  | 1,828,823 |  |  | 1,439,188 |
Subordinated debentures | 1,009,090 |  |  | 929,598 |  |  | 1,008,371 |  |  | 805,600 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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