Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Preferred Stock	Preferred Stock Including Additional Paid in Capital	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance, Preferred shares outstanding at Dec. 31, 2017		5,888,680
Balance, Common shares outstanding at Dec. 31, 2017				18,610,516
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, shares		65,914		2,276,549
Restricted stock granted, net of amortization				71,053
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation				(19,045)
Balance, Preferred shares outstanding at Dec. 31, 2018		5,954,594
Balance, Common shares outstanding at Dec. 31, 2018				20,939,073
Balance at Dec. 31, 2017	$ 557,058		$ 141,294	$ 186	$ 776,245	$ (8,697)	$ (351,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, value	43,457		1,599	22	41,836
Restricted stock granted, net of amortization	1,230			1	1,229
Adjustments for tax withholding on share-based compensation	(364)			0	(364)
Stock issuance costs	(95)		(10)		(85)
Net income (loss)	7,023						(7,023)
Dividends on preferred stock	(11,801)						(11,801)
Dividends on common stock	(42,273)						(42,273)
Other Comprehensive Income (Loss), Net of Tax	(27,082)					(27,082)
Balance at Dec. 31, 2018	$ 527,153		142,883	$ 209	818,861	(35,779)	(399,021)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, shares		833,736		3,664,418
Restricted stock granted, net of amortization				68,004
Stock Repurchased During Period, Shares				(1,709,271)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation				(16,231)
Balance, Preferred shares outstanding at Dec. 31, 2019	6,788,330	6,788,330
Balance, Common shares outstanding at Dec. 31, 2019	22,945,993			22,945,993
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, value	$ 83,812		19,924	$ 36	63,852
Restricted stock granted, net of amortization	1,206			1	1,205
Stock Repurchased During Period, Value	(25,034)			17	(25,017)
Adjustments for tax withholding on share-based compensation	(296)			0	(296)
Stock issuance costs	(258)				(258)
Net income (loss)	(152,668)						152,668
Dividends on preferred stock	(12,967)						(12,967)
Dividends on common stock	(47,545)						(47,545)
Other Comprehensive Income (Loss), Net of Tax	209,585					209,585
Balance at Dec. 31, 2019	$ 582,988		162,807	$ 229	858,347	173,806	(612,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, shares		4,460,000		558,583
Stock Redeemed or Called During Period, Shares		4,000,000
Restricted stock granted, net of amortization				239,661
Stock Repurchased During Period, Shares				(32,925)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation				(13,342)
Balance, Preferred shares outstanding at Dec. 31, 2020	7,248,330	7,248,330
Balance, Common shares outstanding at Dec. 31, 2020	23,697,970			23,697,970
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 548						548
Stock issuance, value	117,818		107,843	$ 6	9,969
Stock Redeemed or Called During Period, Value	100,000		96,086				3,914
Restricted stock granted, net of amortization	1,823			2	1,821
Stock Repurchased During Period, Value	(372)			0	(372)
Adjustments for tax withholding on share-based compensation	(245)			0	(245)
Stock issuance costs	(25)				(25)
Net income (loss)	177,530						(177,530)
Dividends on preferred stock	(13,599)						(13,599)
Dividends on common stock	(38,372)						(38,372)
Other Comprehensive Income (Loss), Net of Tax	(93,545)					(93,545)
Balance at Dec. 31, 2020	$ 633,453		$ 174,564	$ 237	$ 869,495	$ 80,261	$ (491,104)