Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	(Accumulated Deficit) Retained Earnings [Member]
Balance at Dec. 31, 2011	$ 2,827,452	$ 947,017	$ 790,989	$ 2,241,171	$ (114,176)	$ 21,093	$ (1,058,642)
Net income	75,444						75,444
Other comprehensive loss, net of income taxes	(14,090)					(14,090)
Cash dividends declared on Common Stock - $0.01 per share	(15,730)						(15,730)
Cash dividends paid on Series A Preferred Stock	(24,197)			(24,197)
Accretion of discount on Series A Preferred Stock	0	5,076		(5,076)
Settlement of prepaid common stock purchase contracts	0
Restricted share unit activity			1,280	(1,207)			(73)
Share-based compensation expense	4,510			4,510
Balance at Jun. 30, 2012	2,853,389	952,093	792,269	2,215,201	(114,176)	7,003	(999,001)
Balance at Dec. 31, 2012	3,569,431	957,327	792,273	2,189,874	(114,176)	4,101	(259,968)
Net income	75,109						75,109
Other comprehensive loss, net of income taxes	(37,161)					(37,161)
Cash dividends declared on Common Stock - $0.01 per share	(16,981)						(16,981)
Cash dividends paid on Series A Preferred Stock	(24,197)			(24,197)
Accretion of discount on Series A Preferred Stock	0	5,398		(5,398)
Settlement of prepaid common stock purchase contracts	122,848		122,848	(122,848)
Restricted share unit activity	(1,481)		1,022	(2,366)			(137)
Stock options exercised	134		65	69
Share-based compensation expense	3,350			3,350
Balance at Jun. 30, 2013	$ 3,568,204	$ 962,725	$ 916,208	$ 2,038,484	$ (114,176)	$ (33,060)	$ (201,977)