Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2012	$ 6,048,641	$ 1,128,302	$ 4,166,109	$ 1,203,815	$ (446,157)	$ (3,428)
Balance (in shares) at Dec. 31, 2012			184,199,198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	193,413			193,749		(336)
Other comprehensive income	71,601				71,601
Stock Issued During Period, Value, New Issues	587,925	598,941	11,016
Subordinated debt converted to preferred stock	1,210	1,416	(206)
Net activity under employee plans and related tax benefits, shares			237,458
Net activity under employee plans and related tax benefits	17,107		17,107
Dividends on preferred stock	(50,040)			(50,040)
Dividends on common stock	(9,239)			(9,239)
Change in deferred compensation	116			116
Other changes in noncontrolling interests	(402)		(4,166)			3,764
Balance at Jun. 30, 2013	6,860,332	1,728,659	4,167,828	1,338,401	(374,556)	0
Balance (in shares) at Jun. 30, 2013			184,436,656
Balance at Dec. 31, 2013	6,464,563	1,003,970	4,179,024	1,473,670	(192,101)	0
Balance (in shares) at Dec. 31, 2013	184,677,696		184,677,696
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	220,760			220,760		0
Other comprehensive income	55,264				55,264
Subordinated debt converted to preferred stock	31	36	(5)
Net activity under employee plans and related tax benefits, shares			435,269
Net activity under employee plans and related tax benefits	13,117		13,117
Dividends on preferred stock	(40,080)			(40,080)
Dividends on common stock	(14,873)			(14,873)
Change in deferred compensation	1,308			1,308
Balance at Jun. 30, 2014	$ 6,700,090	$ 1,004,006	$ 4,192,136	$ 1,640,785	$ (136,837)	$ 0
Balance (in shares) at Jun. 30, 2014	185,112,965		185,112,965