CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total		6.00% Series B Cumulative Convertible Preferred Stock	7.875% Series A Cumulative Redeemable Preferred Stock	7.625% Series C Cumulative Redeemable Preferred Stock	7.50% Series D Cumulative Redeemable Preferred Stock	Common Stock Par Value	Common Stock Par Value 6.00% Series B Cumulative Convertible Preferred Stock	Additional Paid-In Capital	Additional Paid-In Capital 6.00% Series B Cumulative Convertible Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated Deficit 6.00% Series B Cumulative Convertible Preferred Stock	Accumulated Deficit 7.875% Series A Cumulative Redeemable Preferred Stock	Accumulated Deficit 7.625% Series C Cumulative Redeemable Preferred Stock	Accumulated Deficit 7.50% Series D Cumulative Redeemable Preferred Stock	7.875% Series A Cumulative Redeemable Preferred Stock	7.625% Series C Cumulative Redeemable Preferred Stock	7.50% Series D Cumulative Redeemable Preferred Stock
Beginning balance at Dec. 31, 2011	$ 15,760,642						$ 9,702		$ 15,068,870		$ 3,008,988	$ (2,504,006)					$ 177,088
Preferred dividends declared			(289)	(3,648)									(289)	(3,648)
Net income (loss)	901,806											901,806
Unrealized gains (losses) on available-for-sale securities	(162,259)										(162,259)
Reclassification adjustment for net (gains) losses included in net income (loss)	(80,299)										(80,299)
Exercise of stock options	1,842						1		1,841
Stock option expense and long-term compensation expense	1,849								1,849
Conversion of Series B cumulative preferred stock	32,232		32,272					40		32,232
Contingent beneficial conversion feature on 4% Convertible Senior Notes	23,321								23,321
Offering expenses	(231)								(231)
Common dividends declared	(534,401)											(534,401)
Ending balance at Mar. 31, 2012	15,940,605						9,743		15,127,882		2,766,430	(2,140,538)					177,088
Beginning balance at Dec. 31, 2012	15,924,444	[1]					9,472		14,740,774		3,053,242	(2,792,103)					177,088	290,514	445,457
Preferred dividends declared				(3,648)	(5,719)	(8,625)								(3,648)	(5,719)	(8,625)
Net income (loss)	870,278											870,278
Unrealized gains (losses) on available-for-sale securities	(867,151)										(867,151)
Reclassification adjustment for net (gains) losses included in net income (loss)	(182,843)										(182,843)
Exercise of stock options	265								265
Stock option expense and long-term compensation expense	817								817
Net proceeds from direct purchase and dividend reinvestment	761						1		760
Contingent beneficial conversion feature on 4% Convertible Senior Notes	3,963								3,963
Common dividends declared	(426,173)					(426,173)										(426,173)
Ending balance at Mar. 31, 2013	$ 15,306,369						$ 9,473		$ 14,746,579		$ 2,003,248	$ (2,365,990)					$ 177,088	$ 290,514	$ 445,457

[1] Derived from the audited consolidated financial statements at December 31, 2012.