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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net income $ 696,386 $ 831,353 $ 681,783
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on the sale of investments, net 7,204 13,172 (418)
Stock-based compensation expense 18,446 18,381 20,844
Amortization of premium on investment securities 14,899 18,347 33,739
Deferred income taxes (13,246) 58,168 84,022
Changes in assets and liabilities:      
Other assets 62,976 (50,333) (3,948)
Other accrued liabilities 2,872 (2,036) 9,666
Net cash provided by operating activities 763,001 588,817 709,256
Investing Activities      
Net change in short-term investments (655,596) 61,060 413,773
Purchase of investments available for sale (1,116,120) (1,378,231) (2,270,701)
Proceeds from maturities and paydowns of investments available for sale 664,239 247,296 266,930
Proceeds from sales of investments available for sale 707,544 747,883 1,067,882
Purchase of other invested assets (40,038) (74,620) (67,397)
Net cash used in investing activities (525,569) (398,872) (583,167)
Financing Activities      
Credit facility borrowings 0 0 225,000
Treasury stock acquired (70,670) (97,914) (163,855)
Payment of issuance costs for credit facility 0 (154) (5,849)
Dividends paid (106,215) (92,128) (77,724)
Net cash used in financing activities (176,885) (190,196) (147,428)
Net (decrease) increase in cash 60,547 (251) (21,339)
Supplemental Disclosure of Cash Flow Information      
Interest payments (28,574) (13,595) (6,951)
Noncash Transactions      
Repayment of borrowings with term loan proceeds 0 0 (225,000)
Parent Company      
Operating Activities      
Net income 696,386 831,353 681,783
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in net income of subsidiaries (742,439) (863,579) (693,251)
Loss on the sale of investments, net 11,722 12,170 108
Stock-based compensation expense 1,000 927 917
Amortization of premium on investment securities 324 800 1,438
Deferred income taxes (181) 0 0
Changes in assets and liabilities:      
Other assets 816 1,775 312
Other accrued liabilities 18,365 19,232 21,447
Net cash provided by operating activities 45,993 2,678 12,754
Investing Activities      
Net change in short-term investments (14,370) 94,988 189,804
Purchase of investments available for sale (9,860) (157,468) (273,747)
Proceeds from maturities and paydowns of investments available for sale 24,787 81,351 18,384
Proceeds from sales of investments available for sale 128,249 164,733 101,618
Purchase of other invested assets 60,000
Net cash used in investing activities 128,806 183,604 36,059
Financing Activities      
Credit facility borrowings 0 0 200,000
Treasury stock acquired (70,670) (97,914) (163,855)
Payment of issuance costs for credit facility 0 (154) (5,849)
Dividends paid (106,215) (92,128) (77,724)
Net cash used in financing activities (176,885) (190,196) (47,428)
Net (decrease) increase in cash (2,086) (3,914) 1,385
Cash at beginning of year 6,159 10,073 8,688
Cash at end of year 4,073 6,159 10,073
Supplemental Disclosure of Cash Flow Information      
Interest payments (28,574) (13,595) (4,792)
Noncash Transactions      
Repayment of borrowings with term loan proceeds $ 0 $ 0 $ (225,000)