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Schedule II - Parent Corporation Financial Statements - Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Activities |  |  |
Net income | $ 207,012 | $ 365,238 | $ 224,886
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Stock-based compensation expense | 22,763 | 18,346 | 18,428
Undistributed (gains) losses of equity method investments | (17,778) | (17,083) | (12,946)
Distributions in excess of current year income of equity method investments | 16,750 | 16,052 | 43,184
Amortization – other | 34,800 | 30,040 | 42,336
Changes in assets and liabilities: |  |  |
(Increase) decrease in net federal income taxes | (2,707) | 9,082 | (25,932)
(Increase) decrease in other assets | (34,016) | (23,195) | (37,561)
Increase (decrease) in other liabilities | (13,211) | 16,255 | 49,869
Net cash provided by (used in) operating activities | 1,099,888 | 758,908 | 802,409
Investing Activities |  |  |
Purchases of fixed income securities, available-for-sale | (2,491,852) | (2,438,851) | (2,648,974)
Purchases of equity securities | (46,191) | (24,166) | (26,675)
Purchases of short-term investments | (9,802,626) | (4,479,918) | (4,506,500)
Purchases of alternative investments | (92,207) | (97,597) | (73,408)
Redemption and maturities of fixed income securities, available-for-sale | 997,229 | 509,220 | 669,211
Sales of fixed income securities, available-for-sale | 917,289 | 1,221,918 | 1,211,739
Sales of equity securities | 19,416 | 53,344 | 186,144
Sales of short-term investments | 9,603,377 | 4,611,342 | 4,513,940
Net cash provided by (used in) investing activities | (947,381) | (686,355) | (734,447)
Financing Activities |  |  |
Dividends to preferred stockholders | (9,200) | (9,200) | (9,200)
Dividends to common stockholders | (84,936) | (73,827) | (66,920)
Acquisition of treasury stock | (15,620) | (7,930) | (18,344)
Net proceeds from stock purchase and compensation plans | 9,630 | 9,133 | 9,086
Net cash provided by (used in) financing activities | (102,755) | (84,490) | (87,816)
Net increase (decrease) in cash and restricted cash | 49,752 | (11,937) | (19,854)
Cash, beginning of year | 180 |  |
Cash, end of year | 91 | 180 |
Parent Company |  |  |
Operating Activities |  |  |
Net income | 207,012 | 365,238 | 224,886
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Equity in undistributed income of subsidiaries, net of tax | (198,093) | (316,612) | (152,555)
Stock-based compensation expense | 22,763 | 18,346 | 18,428
Net realized and unrealized investment (gains) losses | (596) | (996) | 17,855
Undistributed (gains) losses of equity method investments | 2,709 | (279) | (2,240)
Distributions in excess of current year income of equity method investments | 0 | 766 | 0
Amortization – other | (28) | (1,020) | (154)
Changes in assets and liabilities: |  |  |
Increase (decrease) in accrued long-term stock compensation | (1,148) | (579) | 136
(Increase) decrease in net federal income taxes | (520) | 1,538 | (3,875)
(Increase) decrease in other assets | 2,064 | 963 | (1,961)
Increase (decrease) in other liabilities | (4,976) | 1,375 | (2,813)
Net cash provided by (used in) operating activities | 29,187 | 68,740 | 97,707
Investing Activities |  |  |
Purchases of fixed income securities, available-for-sale | (15,925) | (72,328) | (208,512)
Purchases of equity securities | (2,153) | (743) | (1,647)
Purchases of short-term investments | (516,183) | (233,129) | (362,213)
Purchases of alternative investments | (3,018) | (53,262) | (4,149)
Redemption and maturities of fixed income securities, available-for-sale | 31,826 | 29,619 | 35,527
Sales of fixed income securities, available-for-sale | 138,546 | 20,314 | 66,725
Sales of equity securities | 0 | 48,960 | 77,971
Sales of short-term investments | 471,650 | 248,588 | 385,254
Proceeds from alternative investments | 0 | 20 | 0
Net cash provided by (used in) investing activities | 104,743 | (11,961) | (11,044)
Financing Activities |  |  |
Dividends to preferred stockholders | (9,200) | (9,200) | (9,200)
Dividends to common stockholders | (84,936) | (73,827) | (66,920)
Acquisition of treasury stock | (15,620) | (7,930) | (18,344)
Net proceeds from stock purchase and compensation plans | 9,630 | 9,133 | 9,086
Proceeds from borrowings from subsidiaries | 0 | 27,000 | 0
Principal payment on borrowings from subsidiaries | (33,893) | (1,801) | (1,714)
Net cash provided by (used in) financing activities | (134,019) | (56,625) | (87,092)
Net increase (decrease) in cash and restricted cash | (89) | 154 | (429)
Cash, beginning of year | 180 | 26 | 455
Cash, end of year | $ 91 | $ 180 | $ 26

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