Consolidated Statements of Shareholders' Equity Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Preferred Stock Dividends, Income Statement Impact	$ 2,294	$ 1,222
Total shareholders' equity	599,015	633,298	585,876	616,710
Stock issuance	144	5,183
Granting and vesting of restricted stock	672	456
Amortization of stock issuance costs	(30)	(30)
Adjustments for tax withholding on share-based compensation	(505)	(546)
Net (loss) income	(734)	19,603
Dividends on preferred stock	(2,294)	(1,222)
Dividends on common stock	(13,674)	(15,902)
Other comprehensive income	29,560	9,046
Preferred Stock Including Additional Paid in Capital [Member]
Total shareholders' equity	109,658	55,407	109,658	55,407
Stock issuance	0
Common Stock [Member]
Total shareholders' equity	547	548	543	543
Stock issuance	1	5
Granting and vesting of restricted stock	4	1
Adjustments for tax withholding on share-based compensation	(1)	(1)
Additional Paid-in Capital [Member]
Total shareholders' equity	761,827	764,272	761,550	759,214
Stock issuance	143	5,178
Granting and vesting of restricted stock	668	455
Amortization of stock issuance costs	(30)	(30)
Adjustments for tax withholding on share-based compensation	(504)	(545)
Accumulated Other Comprehensive (Loss) Income [Member]
Total shareholders' equity	(4,256)	61,557	(33,816)	52,511
Accumulated Deficit [Member]
Total shareholders' equity	(268,761)	(248,486)	(252,059)	(250,965)
Dividends on common stock	$ (13,674)	$ (15,902)