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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net cash provided by operating activities | $ 452,988,000 | $ 352,589,000 | $ 501,584,000
Cash flows from investing activities: |  |  |
Capital distribution from subsidiaries | 6,200,000 | 2,900,000 | 5,200,000
Fixed maturity securities available for sale in nature: |  |  |
Purchases | (784,752,000) | (1,794,817,000) | (1,460,641,000)
Sales | 276,805,000 | 856,291,000 | 336,201,000
Calls or maturities | 294,309,000 | 480,023,000 | 518,557,000
Equity securities available for sale in nature: |  |  |
Purchases | (1,356,493,000) | (1,042,913,000) | (958,008,000)
Sales | 1,356,132,000 | 1,154,523,000 | 943,857,000
Other, net | 10,377,000 | 5,749,000 | 9,069,000
Net cash (used in) provided by investing activities | (295,437,000) | (316,384,000) | (373,670,000)
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (70,322,000) | (105,482,000) | (140,226,000)
Proceeds from stock options exercised | 0 | 0 | 215,000
Proceeds from bank loan | 175,000,000 | 25,000,000 | 0
Net cash provided by (used in) financing activities | 103,576,000 | (81,986,000) | (140,836,000)
Net (decrease) increase in cash | 261,127,000 | (45,781,000) | (12,922,000)
Cash: |  |  |
Beginning of year | 289,776,000 | 335,557,000 | 348,479,000
End of year | 550,903,000 | 289,776,000 | 335,557,000
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 23,000,000 | 16,665,000 | 16,616,000
Income taxes paid (refunded), net | (57,853,000) | (26,542,000) | 69,467,000
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by operating activities | (14,703,000) | 225,000 | (36,662,000)
Cash flows from investing activities: |  |  |
Capital contribution to subsidiaries | (150,000,000) | 0 | 0
Capital distribution from subsidiaries | 0 | 3,431,433 | 0
Distributions received from special purpose entities | 6,210,000 | 2,904,000 | 5,199,000
Dividends received from subsidiaries | 0 | 0 | 191,000,000
Fixed maturity securities available for sale in nature: |  |  |
Purchases | 0 | (11,905,000) | 0
Sales | 0 | 1,000,000 | 0
Calls or maturities | 955,000 | 0 | 0
Equity securities available for sale in nature: |  |  |
Purchases | (1,172,000) | (5,307,000) | (13,151,000)
Sales | 25,848,000 | 48,215,000 | 38,092,000
Decrease (increase) in short-term investments | 26,481,000 | (6,268,000) | (16,172,000)
Other, net | 183,000 | 667,000 | 791,000
Net cash (used in) provided by investing activities | (91,495,000) | 32,737,000 | 205,759,000
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (70,322,000) | (105,482,000) | (140,226,000)
Proceeds from stock options exercised | 0 | 0 | 215,000
Proceeds from bank loan | 175,000,000 | 25,000,000 | 0
Net cash provided by (used in) financing activities | 104,678,000 | (80,482,000) | (140,011,000)
Net (decrease) increase in cash | (1,520,000) | (47,520,000) | 29,086,000
Cash: |  |  |
Beginning of year | 6,218,000 | 53,738,000 | 24,652,000
End of year | 4,698,000 | 6,218,000 | 53,738,000
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 22,959,000 | 16,611,000 | 16,590,000
Income taxes paid (refunded), net | $ 1,630,000 | $ (14,102,000) | $ 18,841,000

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