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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Activities      
Net income $ 729,403 $ 696,386 $ 831,353
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on the sale of investments, net 2,350 7,204 13,172
(Income) loss from other invested assets 2,336 0 0
Dividends from subsidiaries (39,062) (40,038) (74,620)
Stock-based compensation expense 24,778 18,446 18,381
Amortization of premium on investment securities 20,231 14,899 18,347
Deferred income taxes 32,174 (13,246) 58,168
Changes in assets and liabilities:      
Other assets (18,653) 62,976 (50,333)
Other accrued liabilities 34,574 2,872 (2,036)
Net cash provided by operating activities 861,532 763,001 588,817
Investing Activities      
Net change in short-term investments 164,707 (655,596) 61,060
Purchase of investments available for sale (1,648,433) (1,116,120) (1,378,231)
Proceeds from maturities and paydowns of investments available for sale 411,635 664,239 247,296
Proceeds from sales of investments available for sale 415,074 707,544 747,883
Net cash used in investing activities (706,926) (525,569) (398,872)
Financing Activities      
Issuance of senior notes 498,160 0 0
Credit facility repayments (425,000) 0 0
Treasury stock acquired (111,543) (70,670) (97,914)
Payment of debt issuance costs (8,488) 0 (154)
Dividends paid (118,042) (106,215) (92,128)
Net cash used in financing activities (164,913) (176,885) (190,196)
Net (decrease) increase in cash (10,307) 60,547 (251)
Supplemental Disclosure of Cash Flow Information      
Interest payments (17,196) (28,574) (13,595)
Parent Company      
Operating Activities      
Net income 729,403 696,386 831,353
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in net income of subsidiaries (769,963) (742,439) (863,579)
Loss on the sale of investments, net 2 11,722 12,170
(Income) loss from other invested assets 2,336 0 0
Dividends from subsidiaries 300,000 60,000 0
Stock-based compensation expense 1,134 1,000 927
Amortization of premium on investment securities 129 324 800
Deferred income taxes 0 (181) 0
Changes in assets and liabilities:      
Other assets 889 816 1,775
Other accrued liabilities 40,289 18,365 19,232
Net cash provided by operating activities 304,219 45,993 2,678
Investing Activities      
Net change in short-term investments (76,250) (14,370) 94,988
Purchase of investments available for sale (106,653) (9,860) (157,468)
Proceeds from maturities and paydowns of investments available for sale 33,515 24,787 81,351
Proceeds from sales of investments available for sale 8,276 128,249 164,733
Net cash used in investing activities (141,112) 128,806 183,604
Financing Activities      
Issuance of senior notes 498,160 0 0
Credit facility repayments (425,000) 0 0
Treasury stock acquired (111,542) (70,670) (97,914)
Payment of debt issuance costs (8,488) 0 (154)
Dividends paid (118,043) (106,215) (92,128)
Net cash used in financing activities (164,913) (176,885) (190,196)
Net (decrease) increase in cash (1,806) (2,086) (3,914)
Cash at beginning of year 4,073 6,159 10,073
Cash at end of year 2,267 4,073 6,159
Supplemental Disclosure of Cash Flow Information      
Interest payments $ (17,196) $ (28,574) $ (13,595)