Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Series E Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series E Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Series A Preferred Stock [Member]	Retained Earnings [Member] Series B Preferred Stock [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2009	$ 1,955,907				$ 422,109		$ 820	$ 1,007,740	$ 705,897			$ (161,911)	$ (28,389)	$ 9,641
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	72,258								72,255					3
Other comprehensive income (loss)	14,680												14,680
Dividends declared on common stock of $0.04, $0.16 and $0.35 per share during 2010, 2011 and 2012, respectively	(3,133)								(3,133)
Dividends declared on preferred stock $85.00 per share on Series A for 2010, 2011 and 2012 and $49.86 on Series B for 2010		(2,459)	(14,764)							(2,459)	(14,764)
Redemption of preferred stock	(400,000)				(394,442)				(5,558)
Subsidiary preferred stock dividends $0.8624 and $0.8265 per share during 2010 and 2011, respectively	(863)								(863)
Exercise of stock options	378							(538)				916
Net shares acquired related to employee share-based compensation plans	(1,654)											(1,654)
Stock-based compensation, net of tax effects	3,730							863	(5,633)			8,500
Accretion of preferred stock discount	0				1,272				(1,272)
Warburg investment	36,440						21	36,419
Public Offering of common stock	116,163						66	116,097
Issuance of stock	2,196							109	(2,600)			4,687
Ending Balance at Dec. 31, 2010	1,778,879				28,939		907	1,160,690	741,870			(149,462)	(13,709)	9,644
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	151,378								151,379					(1)
Other comprehensive income (loss)	(46,495)												(46,495)
Dividends declared on common stock of $0.04, $0.16 and $0.35 per share during 2010, 2011 and 2012, respectively	(13,978)								(13,978)
Dividends declared on preferred stock $85.00 per share on Series A for 2010, 2011 and 2012 and $49.86 on Series B for 2010	(2,460)									(2,460)
Redemption of preferred stock	(9,577)													(9,577)
Subsidiary preferred stock dividends $0.8624 and $0.8265 per share during 2010 and 2011, respectively	(826)								(826)
Dissolution of joint venture	(66)													(66)
Common stock warrants repurchased	(16,285)							(16,285)
Exercise of stock options	213							(371)				584
Net shares acquired related to employee share-based compensation plans	(1,670)							3				(1,673)
Stock-based compensation, net of tax effects	5,972							1,014	(10,233)			15,191
Issuance of stock	689							295	(325)			719
Ending Balance at Dec. 31, 2011	1,845,774				28,939		907	1,145,346	865,427			(134,641)	(60,204)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	173,697								173,697
Other comprehensive income (loss)	27,938												27,938
Dividends declared on common stock of $0.04, $0.16 and $0.35 per share during 2010, 2011 and 2012, respectively	(30,667)								(30,667)
Dividends declared on preferred stock $85.00 per share on Series A for 2010, 2011 and 2012 and $49.86 on Series B for 2010		(2,460)								(2,460)
Repurchase of 2,518,891 common shares	(50,000)											(50,000)
Common stock warrants repurchased	(388)							(388)
Exercise of stock options	996							(1,988)				2,984
Net shares acquired related to employee share-based compensation plans	(3,243)							0				(3,243)
Stock-based compensation, net of tax effects	8,613							2,090	(5,570)			12,093
Issuance of stock	560			122,710		122,710		560	0			0
Ending Balance at Dec. 31, 2012	$ 2,093,530				$ 151,649		$ 907	$ 1,145,620	$ 1,000,427			$ (172,807)	$ (32,266)	$ 0