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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities      
Net income $ 224,886 $ 403,837 $ 246,355
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Stock-based compensation expense 18,428 15,893 16,227
Undistributed losses of equity method investments (12,946) (69,873) (12,408)
Amortization - other 42,336 55,109 59,350
Changes in assets and liabilities:      
Decrease in net federal income taxes (25,932) (542) 7,708
Increase in other assets (37,561) (33,379) (27,927)
Decrease in other liabilities 49,869 78,121 27,897
Investing Activities      
Purchases of fixed income securities, available-for-sale (2,648,974) (2,165,555) (1,723,818)
Purchases of short-term investments (4,506,500) (4,345,140) (5,762,725)
Purchase of other investments (73,408) (85,044) (79,598)
Redemption and maturities of fixed income securities, available-for-sale 669,211 1,217,555 1,019,132
Sales of fixed income securities, available-for-sale 1,211,739 502,911 487,087
Sales of equity securities 186,144 99,235 1,320
Sales of short-term investments 4,513,940 4,306,684 5,635,463
Proceeds from Limited Partnership Investments 0 959 0
Financing Activities      
Dividends to preferred stockholders (9,200) (9,353) 0
Dividends to common stockholders (66,920) (60,136) (54,486)
Acquisition of treasury stock (18,344) (9,050) (7,053)
Net proceeds from stock purchase and compensation plans 9,086 7,976 8,411
Preferred stock issued, net of issuance costs 0 (479) 195,063
Cash, beginning of year 455    
Cash, end of year 26 455  
Purchases of equity securities (26,675) (88,640) (230,813)
Parent Company [Member]      
Operating Activities      
Net income 224,886 403,837 246,355
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in undistributed income of subsidiaries, net of tax (152,555) (297,220) (176,146)
Stock-based compensation expense 18,428 15,893 16,227
Net realized and unrealized investment losses (gains) 17,855 (1,898) (1,756)
Undistributed losses of equity method investments (2,240) (1,859) 672
Amortization - other (154) 1,076 1,080
Changes in assets and liabilities:      
Increase (decrease) in accrued long-term stock compensation 136 2,727 (366)
Decrease in net federal income taxes (3,875) 3,843 5,549
Increase in other assets (1,961) (7,251) (317)
Decrease in other liabilities (2,813) (1,742) (390)
Net cash provided by operating activities 97,707 117,406 90,908
Investing Activities      
Purchases of fixed income securities, available-for-sale (208,512) (113,829) (89,726)
Purchases of short-term investments (362,213) (330,843) (523,961)
Purchase of other investments (4,149) (4,949) 4,065
Redemption and maturities of fixed income securities, available-for-sale 35,527 51,524 26,877
Sales of fixed income securities, available-for-sale 66,725 15,713 23,276
Sales of equity securities 77,971 31,204 0
Sales of short-term investments 385,254 311,225 523,813
Capital contribution to subsidiaries 0 0 30,000
Net cash used in investing activities (11,044) (44,672) (231,197)
Financing Activities      
Dividends to preferred stockholders (9,200) 9,353 0
Dividends to common stockholders (66,920) (60,136) (54,486)
Acquisition of treasury stock (18,344) (9,050) (7,053)
Proceeds from borrowings 0 0 50,000
Repayment of borrowings 0 0 (50,000)
Net proceeds from stock purchase and compensation plans 9,086 7,976 8,411
Preferred stock issued, net of issuance costs 0 (479) 195,063
Principal payments of borrowings from subsidiaries (1,714) (1,631) (1,552)
Net cash (used in) provided by financing activities (87,092) (72,673) 140,383
Net (decrease) increase in cash (429) 61 94
Cash, beginning of year 455 394 300
Cash, end of year 26 455 394
Purchases of equity securities $ (1,647) $ (5,676) $ (157,411)