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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of Assets Measured for at Fair Value on Recurring Basis | The following tables set forth by level within the fair value hierarchy the Company’s assets measured at fair value on a recurring basis as of the dates presented (in thousands):
|  | Fair Value Measurements
|  | As of December 31, 2023
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Available-For-Sale Debt Securities: |  |  |  |  |  |  |  |
U.S. government obligations and agencies |  | $ | — |  |  | $ | 23,258 |  |  | $ | — |  |  | $ | 23,258 |
Corporate bonds |  | — |  |  | 715,714 |  |  | — |  |  | 715,714 |
Mortgage-backed and asset-backed securities |  | — |  |  | 303,146 |  |  | — |  |  | 303,146 |
Municipal bonds |  | — |  |  | 14,039 |  |  | — |  |  | 14,039 |
Redeemable preferred stock |  | — |  |  | 8,173 |  |  | — |  |  | 8,173 |
Equity Securities: |  |  |  |  |  |  |  |
Common stock |  | 15,438 |  |  | — |  |  | — |  |  | 15,438 |
Mutual funds |  | 65,057 |  |  | — |  |  | — |  |  | 65,057 |
Investment in Private Equity Limited Partnership |  | — |  |  | — |  |  | 10,434 |  |  | 10,434 |
Total assets accounted for at fair value |  | $ | 80,495 |  |  | $ | 1,064,330 |  |  | $ | 10,434 |  |  | $ | 1,155,259 |
|  | Fair Value Measurements
|  | As of December 31, 2022
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Available-For-Sale Debt Securities: |  |  |  |  |  |  |  |
U.S. government obligations and agencies |  | $ | — |  |  | $ | 11,664 |  |  | $ | — |  |  | $ | 11,664 |
Corporate bonds |  | — |  |  | 695,061 |  |  | — |  |  | 695,061 |
Mortgage-backed and asset-backed securities |  | — |  |  | 287,607 |  |  | — |  |  | 287,607 |
Municipal bonds |  | — |  |  | 12,371 |  |  | — |  |  | 12,371 |
Redeemable preferred stock |  | — |  |  | 7,923 |  |  | — |  |  | 7,923 |
Equity Securities: |  |  |  |  |  |  |  |
Common stock |  | 15,313 |  |  | — |  |  | — |  |  | 15,313 |
Mutual funds |  | 70,156 |  |  | — |  |  | — |  |  | 70,156 |
Investment in Private Equity Limited Partnership |  | — |  |  | — |  |  | — |  |  | — |
Total assets accounted for at fair value |  | $ | 85,469 |  |  | $ | 1,014,626 |  |  | $ | — |  |  | $ | 1,100,095 |
Summary of Fair Value Measurement Inputs and Valuation Techniques | The following table summarizes quantitative information related to the significant unobservable inputs for Level 3 investments, which were carried at fair value as of the dates presented (in thousands):
|  |  | As of December 31, 2023
|  |  |  |  |  |  |  |  |  |  | Range
|  |  | Fair Value |  | Valuation Methodology |  | Unobservable Input |  | Weighted Average Mean |  | Minimum |  | Maximum
| Assets: |  |  |  |  |  |  |  |  |  |  |  |
| Investment in Private Equity Limited Partnership |  | $ | 10,434 |  |  | Market Approach |  | Trailing Twelve Month EBITDA Multiple |  | 5.3x |  | 5.3x |  | 5.3x
|  |  | As of December 31, 2022 (1)
|  |  |  |  |  |  |  |  |  |  | Range
|  |  | Fair Value |  | Valuation Methodology |  | Unobservable Input |  | Weighted Average Mean |  | Minimum |  | Maximum
| Assets: |  |  |  |  |  |  |  |  |  |  |  |
| Investment in Private Equity Limited Partnership |  | $ | — |  |  | Market Approach |  | Trailing Twelve Month EBITDA Multiple |  | n/a |  | n/a |  | n/a
(1) The Company made the initial investment in the private equity limited partnership in 2023, resulting in no balances or data being applicable as of December 31, 2022. These estimates may be subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision.
Summary of Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value | The following table summarizes the carrying value and estimated fair values of the Company’s financial instruments not carried at fair value as of the dates presented (in thousands):
|  | As of December 31,
|  | 2023 |  | 2022
|  | Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Liabilities (debt): |  |  |  |  |  |  |  |
Surplus note (1) |  | $ | 4,044 |  |  | $ | 3,783 |  |  | $ | 5,515 |  |  | $ | 5,126 |
5.625% Senior unsecured notes (2) |  | 100,000 |  |  | 98,953 |  |  | 100,000 |  |  | 100,350 |
Total debt |  | $ | 104,044 |  |  | $ | 102,736 |  |  | $ | 105,515 |  |  | $ | 105,476 |
(1) The fair value of the surplus note was determined by management from the expected cash flows discounted using the interest rate quoted by the holder. The SBA is the holder of the surplus note and the quoted interest rate is below prevailing rates quoted by private lending institutions. However, as the Company’s use of funds from the surplus note is limited by the terms of the agreement, the Company has determined the interest rate quoted by the SBA to be appropriate for purposes of establishing the fair value of the note (Level 2). (2) The fair value of the senior unsecured notes was determined based on pricing from quoted prices for similar assets in active markets and was included as Level 2.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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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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