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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:                      
Net investment income                 $ 126,299 $ 125,723 $ 124,538
Net realized investment (losses) gains $ (8,200)       $ (21,600)       (83,807) 81,184 (11,422)
Total revenues                 3,009,300 3,011,773 2,821,041
Expenses:                      
Other operating expenses                 250,839 249,381 219,478
Interest                 3,168 2,637 1,260
Total expenses                 2,938,733 2,764,348 2,688,945
Pre-tax income 23,930 $ 12,267 $ 4,511 $ 29,859 (28,161) $ 37,120 $ 136,436 $ 102,030 70,567 247,425 132,096
Income tax (benefit) expense                 (3,912) 69,476 19,953
Net income $ 23,405 $ 15,270 $ 9,639 $ 26,165 $ (20,956) $ 31,296 $ 94,960 $ 72,649 74,479 177,949 112,143
Parent Company [Member]                      
Revenues:                      
Net investment income                 4,314 4,478 1,293
Net realized investment (losses) gains                 (7,026) (9,428) 3,416
Total revenues                 (2,712) (4,950) 4,709
Expenses:                      
Other operating expenses                 7,526 5,971 2,924
Interest                 2,127 1,746 318
Total expenses                 9,653 7,717 3,242
Pre-tax income                 (12,365) (12,667) 1,467
Income tax (benefit) expense                 (4,708) (100) 3,310
Loss before equity in net income of subsidiaries                 (7,657) (12,567) (1,843)
Equity in net income of subsidiaries                 82,136 190,516 113,986
Net income                 $ 74,479 $ 177,949 $ 112,143