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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Fair value measurements for items measured at fair value | Assets measured at fair value, by hierarchy level, as of March 31, 2026 and December 31, 2025 are shown in tables 6.1a and 6.1b below. The fair value of the assets is estimated using the process described above, and in Note 2 - “Significant Accounting Policies” to the consolidated financial statements in our 2025 Annual Report on Form 10-K.
Assets Carried at Fair Value by Hierarchy Level as of March 31, 2026
Table | 6.1a |  |  |  |  |  |  |  |
(In thousands) |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 233,630 |  |  | $ | 198,760 |  |  | $ | 34,870 |  |  |
Obligations of U.S. states and political subdivisions |  | 1,772,408 |  |  | — |  |  | 1,772,408 |  |  |
Corporate debt securities |  | 2,680,137 |  |  | — |  |  | 2,680,137 |  |  |
ABS |  | 262,641 |  |  | — |  |  | 262,641 |  |  |
RMBS |  | 350,710 |  |  | — |  |  | 350,710 |  |  |
CMBS |  | 258,917 |  |  | — |  |  | 258,917 |  |  |
CLOs |  | 131,221 |  |  | — |  |  | 131,221 |  |  |
Foreign government debt |  | 4,059 |  |  | — |  |  | 4,059 |  |  |
Commercial paper |  | 9,398 |  |  | — |  |  | 9,398 |  |  |
Total fixed income securities |  | 5,703,121 |  |  | 198,760 |  |  | 5,504,361 |  |  |
Equity securities |  | 15,191 |  |  | 15,191 |  |  | — |  |  |
Cash equivalents (1) |  | 245,491 |  |  | 224,114 |  |  | 21,377 |  |  |
Total |  | $ | 5,963,803 |  |  | $ | 438,065 |  |  | $ | 5,525,738 |  |  |
Assets Carried at Fair Value by Hierarchy Level as of December 31, 2025
Table | 6.1b |  |  |  |  |  |  |  |
(In thousands) |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 277,812 |  |  | $ | 241,056 |  |  | $ | 36,756 |  |  |
Obligations of U.S. states and political subdivisions |  | 1,838,764 |  |  | — |  |  | 1,838,764 |  |  |
Corporate debt securities |  | 2,691,272 |  |  | — |  |  | 2,691,272 |  |  |
ABS |  | 226,561 |  |  | — |  |  | 226,561 |  |  |
RMBS |  | 358,024 |  |  | — |  |  | 358,024 |  |  |
CMBS |  | 238,783 |  |  | — |  |  | 238,783 |  |  |
CLOs |  | 99,287 |  |  | — |  |  | 99,287 |  |  |
Foreign government debt |  | 4,067 |  |  | — |  |  | 4,067 |  |  |
Commercial paper |  | 56,661 |  |  | — |  |  | 56,661 |  |  |
Total fixed income securities |  | 5,791,231 |  |  | 241,056 |  |  | 5,550,175 |  |  |
Equity securities |  | 15,322 |  |  | 15,322 |  |  | — |  |  |
Cash equivalents (1) |  | 371,219 |  |  | 363,423 |  |  | 7,796 |  |  |
Total |  | $ | 6,177,772 |  |  | $ | 619,801 |  |  | $ | 5,557,971 |  |  |
(1) Includes restricted cash equivalents |  |  |  |
Carrying value and fair value of financial assets and liabilities | Table 6.2 presents the carrying value and fair value of our financial assets and liabilities disclosed, but not carried, at fair value at March 31, 2026 and December 31, 2025.
Financial Assets and Liabilities Not Measured at Fair Value
Table | 6.2 |  |  |  |  |  |  |  |
|  | March 31, 2026 |  | December 31, 2025
(In thousands) |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial assets |  |  |  |  |  |  |  |
Other invested assets |  | $ | 1,109 |  |  | $ | 1,109 |  |  | $ | 1,109 |  |  | $ | 1,109 |
Financial liabilities |  |  |  |  |  |  |  |
5.25% Senior Notes |  | 646,506 |  |  | 649,363 |  |  | 646,138 |  |  | 650,442 |

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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://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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