CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) Share data in Thousands, unless otherwise specified	Total	Common Stock [Member]	Series B Preferred Stock [Member]	Accumulated (Deficit) Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2010	$ 1,137,437,000	$ 1,292,342,000	$ 148,441,000	$ (293,940,000)	$ (9,406,000)	$ 0
Balance (in shares) at Dec. 31, 2010		136,792,414
Comprehensive income (loss):
Net income	87,544,000			87,544,000
Other comprehensive income, net of taxes	30,200,000				30,200,000
Total comprehensive income	117,744,000
Cash dividends declared common	(13,651,000.00)			(13,651,000.00)
Cash dividends declared preferred	(1,583,000)			(1,583,000)
Shares issued under share-based plans, net of excess tax benefits (in shares)		760,043
Shares issued under share-based plans, net of excess tax benefits	7,197,000	7,197,000
Shares Issued in Private Offering (in shares)		14,330,579
Shares issued in Private Offering (in $)	84,543,000	84,543,000
Amortization of preferred discount	0		1,559,000	(1,559,000)
Repayment of Series B Preferred Stock	(150,000,000)		(150,000,000)
Repurchase of Common Stock Warrants	(1,000,000)	(1,000,000)
Balance at Dec. 31, 2011	1,180,687,000	1,383,082,000	0	(223,189,000)	20,794,000	0
Balance (in shares) at Dec. 31, 2011		151,883,036
Comprehensive income (loss):
Net income	98,910,000			98,910,000
Other comprehensive income, net of taxes	3,535,000				3,535,000
Total comprehensive income	102,445,000
Cash dividends declared common	(61,401,000.00)			(61,401,000.00)
Shares issued under share-based plans, net of excess tax benefits (in shares)		780,549
Shares issued under share-based plans, net of excess tax benefits	7,092,000	4,562,000				2,530,000
Treasury Stock Purchased (in shares)		(7,500,000)
Treasury Stock Purchased (in $)	(67,531,000)					(67,531,000)
Balance at Dec. 31, 2012	1,161,292,000	1,387,644,000	0	(185,680,000)	24,329,000	(65,001,000)
Balance (in shares) at Dec. 31, 2012		145,163,585
Comprehensive income (loss):
Net income	53,387,000			53,387,000
Other comprehensive income, net of taxes	(45,486,000)				(45,486,000)
Total comprehensive income	7,901,000
Cash dividends declared common	(43,697,000.00)			(43,697,000.00)
Shares issued under share-based plans, net of excess tax benefits (in shares)		635,166
Shares issued under share-based plans, net of excess tax benefits	6,370,000	322,000				6,048,000
Balance at Dec. 31, 2013	$ 1,131,866,000	$ 1,387,966,000	$ 0	$ (175,990,000)	$ (21,157,000)	$ (58,953,000)
Balance (in shares) at Dec. 31, 2013		145,798,751
Comprehensive income (loss):
Treasury Stock Purchased (in shares)	7,000					7,000
Balance at Mar. 31, 2014