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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:                      
Net investment income                 $ 141,263 $ 135,838 $ 124,930
Net realized investment gains (losses)                 222,793 (133,520) 83,650
Other                 9,044 9,275 11,945
Total revenues                 3,972,518 3,380,004 3,415,962
Expenses:                      
Other operating expenses                 269,305 244,630 233,475
Interest                 17,035 17,036 15,168
Total expenses                 3,594,449 3,410,619 3,248,877
Income (loss) before income taxes $ 28,465 $ 80,840 $ 101,595 $ 167,169 $ (114,448) $ 70,286 $ 73,246 $ (59,699) 378,069 (30,615) 167,085
Income tax expense (benefit)                 57,982 (24,887) 22,208
Net income (loss) $ 31,688 $ 69,282 $ 83,250 $ 135,867 $ (81,879) $ 58,578 $ 60,180 $ (42,607) 320,087 (5,728) 144,877
Parent Company [Member]                      
Revenues:                      
Net investment income                 3,735 4,661 4,090
Net realized investment gains (losses)                 31,682 (10,797) 19,279
Other                 5 2 0
Total revenues                 35,422 (6,134) 23,369
Expenses:                      
Other operating expenses                 2,592 2,343 1,918
Interest                 17,036 17,036 14,856
Total expenses                 19,628 19,379 16,774
Income (loss) before income taxes                 15,794 (25,513) 6,595
Income tax expense (benefit)                 2,816 (5,144) 1,572
Income (loss) before equity in net income of subsidiaries                 12,978 (20,369) 5,023
Equity in net income of subsidiaries                 307,109 14,641 139,854
Net income (loss)                 $ 320,087 $ (5,728) $ 144,877