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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net income $ 365,238 $ 224,886 $ 403,837
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Stock-based compensation expense 18,346 18,428 15,893
Undistributed losses of equity method investments (17,083) (12,946) (69,873)
Distributions in excess of current year income of equity method investments 16,052 43,184 2,910
Amortization - other 30,040 42,336 55,109
Changes in assets and liabilities:      
(Increase) decrease in net federal income taxes 9,082 (25,932) (542)
(Increase) decrease in other assets (23,195) (37,561) (33,379)
Increase (decrease) in other liabilities 16,255 49,869 78,121
Investing Activities      
Purchases of fixed income securities, available-for-sale (2,438,851) (2,648,974) (2,165,555)
Purchases of equity securities (24,166) (26,675) (88,640)
Purchases of short-term investments (4,479,918) (4,506,500) (4,345,140)
Purchase of other investments (97,597) (73,408) (85,044)
Redemption and maturities of fixed income securities, available-for-sale 509,220 669,211 1,217,555
Sales of fixed income securities, available-for-sale 1,221,918 1,211,739 502,911
Sales of equity securities 53,344 186,144 99,235
Sales of short-term investments 4,611,342 4,513,940 4,306,684
Financing Activities      
Dividends to preferred stockholders (9,200) (9,200) (9,353)
Dividends to common stockholders (73,827) (66,920) (60,136)
Acquisition of treasury stock (7,930) (18,344) (9,050)
Net proceeds from stock purchase and compensation plans 9,133 9,086 7,976
Preferred stock issued, net of issuance costs 0 0 (479)
Cash, beginning of year 26    
Cash, end of year 180 26  
Parent Company [Member]      
Operating Activities      
Net income 365,238 224,886 403,837
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in undistributed income of subsidiaries, net of tax (316,612) (152,555) (297,220)
Stock-based compensation expense 18,346 18,428 15,893
Net realized and unrealized investment (gains) losses (996) 17,855 (1,898)
Undistributed losses of equity method investments (279) (2,240) (1,859)
Distributions in excess of current year income of equity method investments 766 0 0
Amortization - other 1,020 154 1,076
Changes in assets and liabilities:      
Increase (decrease) in accrued long-term stock compensation (579) 136 2,727
(Increase) decrease in net federal income taxes 1,538 (3,875) 3,843
(Increase) decrease in other assets 963 (1,961) (7,251)
Increase (decrease) in other liabilities 1,375 (2,813) (1,742)
Net cash provided by (used in) operating activities 68,740 97,707 117,406
Investing Activities      
Purchases of fixed income securities, available-for-sale (72,328) (208,512) (113,829)
Purchases of equity securities (743) (1,647) (5,676)
Purchases of short-term investments (233,129) (362,213) (330,843)
Purchase of other investments (53,262) (4,149) (4,949)
Redemption and maturities of fixed income securities, available-for-sale 29,619 35,527 51,524
Sales of fixed income securities, available-for-sale 20,314 66,725 15,713
Sales of equity securities 48,960 77,971 31,204
Sales of short-term investments 248,588 385,254 311,225
Proceeds from Limited Partnership Investments 20 0 959
Net cash provided by (used in) investing activities (11,961) (11,044) (44,672)
Financing Activities      
Dividends to preferred stockholders (9,200) (9,200) (9,353)
Dividends to common stockholders (73,827) (66,920) (60,136)
Acquisition of treasury stock (7,930) (18,344) (9,050)
Net proceeds from stock purchase and compensation plans 9,133 9,086 7,976
Preferred stock issued, net of issuance costs 0 0 (479)
Proceeds from Related Party Debt 27,000 0 0
Principal payments of borrowings from subsidiaries (1,801) (1,714) (1,631)
Net cash provided by (used in) financing activities (56,625) (87,092) (72,673)
Net increase (decrease) in cash 154 (429) 61
Cash, beginning of year 26 455 394
Cash, end of year $ 180 $ 26 $ 455