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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:                      
Net investment income                 $ 124,930 $ 121,871 $ 126,299
Net realized investment gains (losses)                 83,650 (34,255) (83,807)
Other                 11,945 8,294 8,911
Total revenues                 3,415,962 3,227,683 3,009,300
Expenses:                      
Other operating expenses                 233,475 235,314 250,839
Interest                 15,168 3,962 3,168
Total expenses                 3,248,877 3,156,959 2,938,733
Income before income taxes $ 9,487 $ 58,247 $ 68,752 $ 30,599 $ (51,270) $ 31,625 $ 64,335 $ 26,034 167,085 70,724 70,567
Income tax expense (benefit)                 22,208 (2,320) (3,912)
Net income $ 19,779 $ 46,485 $ 51,633 $ 26,980 $ (26,082) $ 26,930 $ 48,873 $ 23,323 144,877 73,044 74,479
Parent Company [Member]                      
Revenues:                      
Net investment income                 4,090 4,032 4,314
Net realized investment gains (losses)                 19,279 6,062 (7,026)
Other                 0 17 0
Total revenues                 23,369 10,111 (2,712)
Expenses:                      
Other operating expenses                 1,918 2,673 7,526
Interest                 14,856 2,690 2,127
Total expenses                 16,774 5,363 9,653
Income before income taxes                 6,595 4,748 (12,365)
Income tax expense (benefit)                 1,572 8,514 (4,708)
Income (loss) before equity in net income of subsidiaries                 (5,023) 3,766 7,657
Equity in net income of subsidiaries                 139,854 76,810 82,136
Net income                 $ 144,877 $ 73,044 $ 74,479