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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Net investment income									$ 124,538	$ 131,896	$ 140,947
Net realized investment (losses) gains									(11,422)	66,380	58,397
Total revenues									2,821,041	2,783,370	2,777,285
Expenses:
Other operating expenses									219,478	207,281	215,711
Other operating expenses									1,260	1,543	5,549
Total expenses									2,688,945	2,648,060	2,532,186
Income before income taxes	11,268	54,793	(24,959)	90,994	(39,161)	91,330	(18,853)	101,994	132,096	135,310	245,099
Income tax (benefit) expense									19,953	18,399	53,935
Net income	15,376	39,570	(9,264)	66,461	(17,382)	66,201	(5,264)	73,356	112,143	116,911	191,164
Parent Company [Member]
Revenues:
Net investment income									1,293	1,114	1,411
Net realized investment (losses) gains									3,416	697	(1,866)
Total revenues									4,709	1,811	(455)
Expenses:
Other operating expenses									2,924	1,688	2,267
Other operating expenses									318	0	1,341
Total expenses									3,242	1,688	3,608
Income before income taxes									1,467	123	(4,063)
Income tax (benefit) expense									3,310	1,800	(684)
Loss before equity in net income of subsidiaries									(1,843)	(1,677)	(3,379)
Equity in net income of subsidiaries									113,986	118,588	194,543
Net income									$ 112,143	$ 116,911	$ 191,164