CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock Member	Preferred Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Treasury Stock Member	Accumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2012	$ 4,110,000	$ 1,032	$ 50,160	$ 4,150,294	$ 11,826	$ (444)	$ (102,868)
Net Income	(120,307)				(120,307)
Issuance of stock	1,545	1		1,544
Dividends Abstract
Dividends, Preferred Stock, Cash	(930)				(930)
Treasury Stock Value Acquired Cost Method	(25)					(25)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(19,140)						(19,140)
Ending Balance at Mar. 31, 2013	3,971,143	1,033	50,160	4,151,838	(109,411)	(469)	(122,008)
Beginning Balance at Dec. 31, 2013	4,626,150	1,034	50,160	4,170,152	594,430	(881)	(188,745)
Net Income	86,409				86,409
Issuance of stock	1,666	1		1,665
Dividends Abstract
Dividends, Preferred Stock, Cash	(931)				(931)
Treasury Stock Value Acquired Cost Method	(17)					(17)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	32,470						32,470
Ending Balance at Mar. 31, 2014	$ 4,745,747	$ 1,035	$ 50,160	$ 4,171,817	$ 679,908	$ (898)	$ (156,275)