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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)

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