Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Net investment income									$ 131,896	$ 140,947	$ 143,814
Net realized investment gains									66,380	58,397	57,089
Total revenues									2,783,370	2,777,285	2,775,885
Expenses:
Other operating expenses									207,281	215,711	255,358
Other operating expenses									1,543	5,549	6,806
Total expenses									2,648,060	2,532,186	2,593,495
Income before income taxes	(39,161)	91,330	(18,853)	101,994	110,693	(18,118)	75,613	76,911	135,310	245,099	182,390
Income tax (benefit) expense									18,399	53,935	30,192
Net income	(17,382)	66,201	(5,264)	73,356	79,469	(3,782)	57,251	58,226	116,911	191,164	152,198
Parent Company [Member]
Revenues:
Net investment income									1,114	1,411	951
Net realized investment gains									697	(1,866)	1,420
Total revenues									1,811	(455)	2,371
Expenses:
Other operating expenses									1,688	2,267	12,945
Other operating expenses									0	1,341	2,180
Total expenses									1,688	3,608	15,125
Income before income taxes									123	(4,063)	(12,754)
Income tax (benefit) expense									1,800	(684)	(3,507)
Loss before equity in net income of subsidiaries									(1,677)	(3,379)	(9,247)
Equity in net income of subsidiaries									118,588	194,543	161,445
Net income									$ 116,911	$ 191,164	$ 152,198