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Schedule II - Parent Corporation Financial Statements - Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
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