Consolidated Statements of Shareholders' Equity Statement - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Preferred Stock	Preferred Stock Including Additional Paid in Capital	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Balance, Preferred stock, Shares outstanding at Dec. 31, 2016	4,571,937	4,571,937
Balance, Common stock, shares outstanding at Dec. 31, 2016	49,153,463			49,153,463
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		1,093,164		2,048,288
Stock Issued During Period, Shares, Restricted Stock Award, Gross				138,166
Shares Paid for Tax Withholding for Share Based Compensation				(77,567)
Balance, Preferred stock, Shares outstanding at Sep. 30, 2017	5,665,101	5,665,101
Balance, Common stock, shares outstanding at Sep. 30, 2017	51,262,350			51,262,350
Balance at Dec. 31, 2016	$ 467,184		$ 110,005	$ 492	$ 727,369	$ (32,609)	$ (338,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	40,379		25,884	21	14,474
Restricted stock granted, net of amortization	1,566			1	1,565
Adjustments for tax withholding on share-based compensation	(521)			(1)	(520)
Stock issuance costs	(104)		(61)		(43)
Net income	11,931						11,931
Dividends on preferred stock	(7,885)						(7,885)
Dividends on common stock	(26,946)						(26,946)
Other comprehensive income	38,495					38,495
Balance at Sep. 30, 2017	$ 524,099		$ 135,828	$ 513	$ 742,845	$ 5,886	$ (360,973)