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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net cash provided by operating activities $ 1,037,117,000 $ 453,004,000 $ 352,589,000
Cash flows from investing activities:      
Capital contribution to subsidiaries     0
Capital distribution from subsidiaries 300,000 6,200,000 2,900,000
Fixed maturity securities available for sale in nature:      
Purchases (1,720,986,000) (784,752,000) (1,794,817,000)
Sales 171,432,000 276,805,000 856,291,000
Calls or maturities 940,858,000 294,309,000 480,023,000
Equity securities available for sale in nature:      
Purchases (1,663,525,000) (1,356,493,000) (1,042,913,000)
Sales 1,550,229,000 1,356,132,000 1,154,523,000
Other, net 11,411,000 10,377,000 5,749,000
Net cash provided by (used in) investing activities (796,656,000) (295,453,000) (316,384,000)
Cash flows from financing activities:      
Dividends paid to shareholders (70,326,000) (70,322,000) (105,482,000)
Proceeds from stock options exercised 752,000 0 0
Proceeds from bank loan 0 175,000,000 25,000,000
Net cash (used in) provided by financing activities (71,107,000) 103,576,000 (81,986,000)
Net increase (decrease) in cash 169,354,000 261,127,000 (45,781,000)
Cash:      
Beginning of year 550,903,000 289,776,000 335,557,000
End of year 720,257,000 550,903,000 289,776,000
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Interest paid 30,077,000 23,000,000 16,665,000
Income taxes (refunded) paid, net 94,935,000 (57,853,000) (26,542,000)
Parent Company      
Cash flows from operating activities:      
Net cash provided by operating activities (28,137,000) (14,703,000) 225,000
Cash flows from investing activities:      
Capital contribution to subsidiaries (165,000) (150,000,000) 0
Capital distribution from subsidiaries 0 0 3,431,433
Distributions received from special purpose entities 300,000 6,210,000 2,904,000
Dividends received from subsidiaries 100,000,000 0 0
Fixed maturity securities available for sale in nature:      
Purchases 0 0 (11,905,000)
Sales 5,000,000 0 1,000,000
Calls or maturities 5,000,000 955,000 0
Equity securities available for sale in nature:      
Purchases (2,399,000) (1,172,000) (5,307,000)
Sales 4,057,000 25,848,000 48,215,000
Decrease (increase) in short-term investments 493,000 26,481,000 (6,268,000)
Other, net 43,000 183,000 667,000
Net cash provided by (used in) investing activities 112,329,000 (91,495,000) 32,737,000
Cash flows from financing activities:      
Dividends paid to shareholders (70,326,000) (70,322,000) (105,482,000)
Proceeds from stock options exercised 752,000 0 0
Proceeds from bank loan 0 175,000,000 25,000,000
Net cash (used in) provided by financing activities (69,574,000) 104,678,000 (80,482,000)
Net increase (decrease) in cash 14,618,000 (1,520,000) (47,520,000)
Cash:      
Beginning of year 4,698,000 6,218,000 53,738,000
End of year 19,316,000 4,698,000 6,218,000
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Interest paid 30,009,000 22,959,000 16,611,000
Income taxes (refunded) paid, net $ (7,075,000) $ 1,630,000 $ (14,102,000)