Consolidated Statements Of Changes In Stockholder's Equity (USD $) In Thousands, except Share data		Common Stock (Shares Outstanding) [Member]	Additional Paid-In Capital [Member] USD ($)	Accumulated Other Comprehensive Income (Loss), Net Of Deferred Income Taxes [Member] USD ($)	Retained Earnings [Member] USD ($)	Total USD ($)
Balance, beginning of period at Dec. 31, 2008			$ 315,771	$ (72,063)	$ 1,959,260
Balance, beginning of period, shares at Dec. 31, 2008		1,000
Share-based compensation plans			5,414
Cumulative adjustment of initial adoption, net of tax	[1]			(15,500)	15,500
Net increase (decrease) during the period				254,541		254,541
Net income (loss)					395,851	395,851
Balance, end of period at Dec. 31, 2009			321,185	166,978	2,370,611	2,858,774
Balance, end of period, shares at Dec. 31, 2009		1,000
Share-based compensation plans			6,582
Net increase (decrease) during the period				(3,012)		(3,012)
Net income (loss)					265,397	265,397
Balance, end of period at Dec. 31, 2010			327,767	163,966	2,636,008	3,127,741
Balance, end of period, shares at Dec. 31, 2010		1,000				1,000
Share-based compensation plans			6,441
Reclassification due to sale of subsidiary to related party			(792)	792
Net increase (decrease) during the period				10,032		10,032
Net income (loss)					(202,821)	(202,821)
Balance, end of period at Dec. 31, 2011			$ 333,416	$ 174,790	$ 2,433,187	$ 2,941,393
Balance, end of period, shares at Dec. 31, 2011		1,000				1,000

[1] The cumulative adjustment to accumulated other comprehensive income (loss), net of deferred income taxes, and retained earnings, represents the effect of initially adopting new guidance for other-than-temporary impairments of debt securities.