Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Series A Preferred Stock [Member]	Series C Preferred Stock [Member]	Preferred Stock [Member] Series A Preferred Stock [Member]	Preferred Stock [Member] Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Series A Preferred Stock [Member]	Additional Paid-In Capital [Member] Series C Preferred Stock [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2012	$ 3,569,431			$ 957,327		$ 792,273	$ 2,189,874			$ (114,176)	$ 4,101	$ (259,968)
Net income	29,574											29,574
Other comprehensive income (loss), net of income taxes	(1,314)										(1,314)
Cash dividends declared on Common Stock - $0.03 per share	(7,876)											(7,876)
Cash dividends paid on Preferred Stock		(12,098)						(12,098)
Accretion of discount on Series A Preferred Stock		0		2,678				(2,678)
Restricted share unit activity	(1,481)					1,021	(2,365)					(137)
Stock options exercised	51					25	26
Share-based compensation expense	1,819						1,819
Balance at Mar. 31, 2013	3,578,106			960,005		793,319	2,174,578			(114,176)	2,787	(238,407)
Balance at Dec. 31, 2013	2,948,985				125,862	978,045	2,138,024			(114,176)	(41,258)	(137,512)
Net income	48,416											48,416
Other comprehensive income (loss), net of income taxes	10,795										10,795
Cash dividends declared on Common Stock - $0.03 per share	(9,728)											(9,728)
Cash dividends paid on Preferred Stock			(2,559)						(2,559)
Issuance of stock, net of issuance costs			118		118
Restricted share unit activity	(468)					233	(701)
Stock options exercised	539					222	317
Share-based compensation tax benefit	170						170
Share-based compensation expense	2,228						2,228
Balance at Mar. 31, 2014	$ 2,998,496				$ 125,980	$ 978,500	$ 2,137,479			$ (114,176)	$ (30,463)	$ (98,824)