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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:                      
Net investment income                 $ 121,871 $ 126,299 $ 125,723
Net realized investment (losses) gains         $ (8,200)       (34,255) (83,807) 81,184
Other                 8,294 8,911 8,671
Total revenues                 3,227,683 3,009,300 3,011,773
Expenses:                      
Other operating expenses                 235,314 250,839 249,381
Interest                 3,962 3,168 2,637
Total expenses                 3,156,959 2,938,733 2,764,348
Pre-tax income $ (51,270) $ 31,625 $ 64,335 $ 26,034 23,930 $ 12,267 $ 4,511 $ 29,859 70,724 70,567 247,425
Income tax expense (benefit)                 2,320 3,912 (69,476)
Net income $ (26,082) $ 26,930 $ 48,873 $ 23,323 $ 23,405 $ 15,270 $ 9,639 $ 26,165 73,044 74,479 177,949
Parent Company [Member]                      
Revenues:                      
Net investment income                 4,032 4,314 4,478
Net realized investment (losses) gains                 6,062 (7,026) (9,428)
Other                 17 0 0
Total revenues                 10,111 (2,712) (4,950)
Expenses:                      
Other operating expenses                 2,673 7,526 5,971
Interest                 2,690 2,127 1,746
Total expenses                 5,363 9,653 7,717
Pre-tax income                 4,748 (12,365) (12,667)
Income tax expense (benefit)                 (8,514) 4,708 100
Loss before equity in net income of subsidiaries                 (3,766) (7,657) (12,567)
Equity in net income of subsidiaries                 73,864 82,136 190,516
Net income                 $ 70,098 $ 74,479 $ 177,949