Statement of Stockholders' Equity (USD $) In Thousands	Total	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Preferred Stock Member	Cumulative Preference Stock [Member]	Common Stock [Member]
Balance as of at Dec. 31, 2008		$ 259,306	$ 4,165,503	$ (598,755)	$ (4,453,969)	$ 7	$ 976	$ 323,338
Net Income Loss	423,445		423,445
Other comprehensive income (loss)				138,963
Common stock			297,483
Preference stock			72
Issuances of common stock	36,419	(22,017)
Conversions to common stock		2,343			(2,454)	3	108
Pre-tax stock-based compensation		21,761
Adjustments to additional paid in capital, tax effect from share- based compensation		(574)
Balance as of at Dec. 31, 2009		256,133	4,291,393	(459,792)	(4,415,096)	4	868	323,338
Net Income Loss	292,379		292,379
Other comprehensive income (loss)				(14,014)
Common stock			301,391
Preference stock			65
Issuances of common stock	(24,039)				33,249
Conversions to common stock		1,618			(1,734)		116
Pre-tax stock-based compensation		20,452
Repurchase of common stock					100,000
Balance as of at Dec. 31, 2010	(96,581)	250,928	4,282,316	(473,806)	(4,480,113)	4	752	323,338
Net Income Loss	617,480		617,480
Other comprehensive income (loss)				(187,839)
Common stock			299,521
Preference stock			58
Issuances of common stock		(27,283)			35,865
Conversions to common stock	93	2,009			(2,102)
Pre-tax stock-based compensation	18,948
Repurchase of common stock					99,997
Balance as of at Dec. 31, 2011	$ (38,986)	$ 240,584	$ 4,600,217	$ (661,645)	$ (4,542,143)	$ 4	$ 659	$ 323,338