Consolidated Statements of Changes in Stockholder's Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred Equity	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2012	$ 2,936,399	$ 63,272	$ 1,750	$ 1,602,136	$ 1,281,811	$ 48,603	$ (61,173)
Comprehensive (loss) income:
Net income	140,934	0	0	0	140,934	0	0
Other comprehensive income (loss)	(85,723)	0	0	0	0	(85,723)	0
Comprehensive income (loss)	55,211
Common stock issued:
Stock-based compensation plans, net	6,875	0	0	564	(17,057)	0	23,368
Purchase of treasury stock	(93,294)	0	0	0	0	0	(93,294)
Cash dividends:
Common stock	(40,223)	0	0	0	(40,223)	0	0
Preferred stock	(3,885)	0	0	0	(3,885)	0	0
Accretion of preferred stock discount	0	0	0	0	0	0	0
Purchase of Preferred Stock	(617)	(535)	0	0	(82)	0	0
Stock-based compensation expense, net	11,368	0	0	11,368	0	0	0
Tax benefit of stock options	448	0	0	448	0	0	0
Ending balance at Sep. 30, 2013	2,872,282	62,737	1,750	1,614,516	1,361,498	(37,120)	(131,099)
Beginning balance at Dec. 31, 2013	2,891,290	61,862	1,750	1,617,990	1,392,508	(24,244)	(158,576)
Comprehensive (loss) income:
Net income	141,771	0	0	0	141,771	0	0
Other comprehensive income (loss)	22,519	0	0	0	0	22,519	0
Comprehensive income (loss)	164,290
Common stock issued:
Stock-based compensation plans, net	11,131	0	0	1,863	(20,556)	0	29,824
Purchase of treasury stock	(162,743)	0	0	0	0	0	(162,743)
Cash dividends:
Common stock	(43,299)	0	0		(43,299)	0	0
Preferred stock	(3,777)	0	0	0	(3,777)	0	0
Purchase of common stock returned to authorized but unissued	0	0	(31)	(50,467)	0	0	50,498
Purchase of Preferred Stock	(960)	(838)	0	0	(122)	0	0
Stock-based compensation expense, net	12,462	0	0	12,462	0	0	0
Tax benefit of stock options	1,184	0	0	1,184	0	0	0
Ending balance at Sep. 30, 2014	$ 2,869,578	$ 61,024	$ 1,719	$ 1,583,032	$ 1,466,525	$ (1,725)	$ (240,997)