Consolidated Statements Of Changes In Stockholder's Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member] USD ($)	Accumulated Other Comprehensive Income (Loss), Net Of Deferred Income Taxes [Member] USD ($)	Retained Earnings [Member] USD ($)	Total USD ($)
Balance, beginning of period at Jun. 30, 2011		$ 330,990	$ 199,219	$ 2,547,282
Balance, beginning of period, shares at Jun. 30, 2011	1,000
Share-based compensation plans		1,657
Net increase (decrease) during the period			3,981		3,981
Net income (loss)				261	261
Balance, end of period at Sep. 30, 2011		332,647	203,200	2,547,543	3,083,390
Balance, end of period, shares at Sep. 30, 2011	1,000
Balance, beginning of period at Dec. 31, 2010		327,767	163,966	2,636,008
Balance, beginning of period, shares at Dec. 31, 2010	1,000
Share-based compensation plans		4,880
Net increase (decrease) during the period			39,234		39,234
Net income (loss)				(88,465)	(88,465)
Balance, end of period at Sep. 30, 2011		332,647	203,200	2,547,543	3,083,390
Balance, end of period, shares at Sep. 30, 2011	1,000
Balance, beginning of period at Dec. 31, 2011		333,416	174,790	2,433,187	2,941,393
Balance, beginning of period, shares at Dec. 31, 2011	1,000				1,000
Share-based compensation plans		5,062
Net increase (decrease) during the period			41,110		41,110
Net income (loss)				496,362	496,362
Balance, end of period at Sep. 30, 2012		338,478	215,900	2,929,549	3,483,927
Balance, end of period, shares at Sep. 30, 2012	1,000				1,000
Balance, beginning of period at Jun. 30, 2012		336,813	181,103	2,773,564
Balance, beginning of period, shares at Jun. 30, 2012	1,000
Share-based compensation plans		1,665
Net increase (decrease) during the period			34,797		34,797
Net income (loss)				155,985	155,985
Balance, end of period at Sep. 30, 2012		$ 338,478	$ 215,900	$ 2,929,549	$ 3,483,927
Balance, end of period, shares at Sep. 30, 2012	1,000				1,000