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, 2018		5,954,594
Balance, Common shares outstanding at Dec. 31, 2018				20,939,073
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, shares		213,468		3,109,047
Restricted stock granted, net of amortization				50,821
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation				16,231
Balance, Preferred shares outstanding at Mar. 31, 2019		6,168,062
Balance, Common shares outstanding at Mar. 31, 2019				24,082,710
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, value	58,887		5,015	31	53,841
Restricted stock granted, net of amortization	298			1	297
Adjustments for tax withholding on share-based compensation	(296)			0	(296)
Stock issuance costs	(212)				(212)
Net (loss) income	(52,214)						(52,214)
Dividends on preferred stock	(3,059)						(3,059)
Dividends on common stock	(12,350)						(12,350)
Other Comprehensive Income (Loss), Net of Tax	86,467					86,467
Balance at Mar. 31, 2019	604,674		147,898	$ 241	872,491	50,688	(466,644)
Balance, Preferred shares outstanding at Dec. 31, 2018		5,954,594
Balance, Common shares outstanding at Dec. 31, 2018				20,939,073
Balance, Preferred shares outstanding at Jun. 30, 2019		6,514,130
Balance, Common shares outstanding at Jun. 30, 2019				24,646,964
Balance at Dec. 31, 2018	527,153		142,883	$ 209	818,861	(35,779)	(399,021)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(171,199)
Other Comprehensive Income (Loss), Net of Tax	197,594
Balance at Jun. 30, 2019	598,638		156,071	$ 246	882,633	161,815	(602,127)
Balance, Preferred shares outstanding at Mar. 31, 2019		6,168,062
Balance, Common shares outstanding at Mar. 31, 2019				24,082,710
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, shares		346,068		547,071
Restricted stock granted, net of amortization				17,183
Balance, Preferred shares outstanding at Jun. 30, 2019		6,514,130
Balance, Common shares outstanding at Jun. 30, 2019				24,646,964
Balance at Mar. 31, 2019	604,674		147,898	$ 241	872,491	50,688	(466,644)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance, value	18,052		8,173	5	9,874
Restricted stock granted, net of amortization	296			0	296
Stock issuance costs	(28)				(28)
Net (loss) income	(118,985)						(118,985)
Dividends on preferred stock	(3,206)						(3,206)
Dividends on common stock	(13,292)						(13,292)
Other Comprehensive Income (Loss), Net of Tax	111,127					111,127
Balance at Jun. 30, 2019	$ 598,638		156,071	$ 246	882,633	161,815	(602,127)
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, shares		4,460,000
Stock Redeemed or Called During Period, Shares		4,000,000
Restricted stock granted, net of amortization				67,511
Stock Repurchased During Period, Shares				(18,782)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation				(12,744)
Balance, Preferred shares outstanding at Mar. 31, 2020		7,248,330
Balance, Common shares outstanding at Mar. 31, 2020				22,981,978
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, value	107,988		107,988
Stock Redeemed or Called During Period, Value	100,000		96,086				3,914
Restricted stock granted, net of amortization	307			1	306
Stock Repurchased During Period, Value	(206)			0	(206)
Adjustments for tax withholding on share-based compensation	(235)			0	(235)
Stock issuance costs	(9)				(9)
Net (loss) income	(98,479)						98,479
Dividends on preferred stock	(3,841)						(3,841)
Dividends on common stock	(10,330)						(10,330)
Other Comprehensive Income (Loss), Net of Tax	72,972					72,972
Balance at Mar. 31, 2020	$ 550,607		174,709	$ 230	858,203	246,778	(729,313)
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
Balance, Preferred shares outstanding at Jun. 30, 2020	7,248,330	7,248,330
Balance, Common shares outstanding at Jun. 30, 2020	23,140,617			23,140,617
Balance at Dec. 31, 2019	$ 582,988		162,807	$ 229	858,347	173,806	(612,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	96,359
Other Comprehensive Income (Loss), Net of Tax	(92,075)
Balance at Jun. 30, 2020	$ 567,469		174,709	$ 231	858,451	81,731	(547,653)
Balance, Preferred shares outstanding at Mar. 31, 2020		7,248,330
Balance, Common shares outstanding at Mar. 31, 2020				22,981,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock granted, net of amortization				172,782
Stock Repurchased During Period, Shares				(14,143)
Balance, Preferred shares outstanding at Jun. 30, 2020	7,248,330	7,248,330
Balance, Common shares outstanding at Jun. 30, 2020	23,140,617			23,140,617
Balance at Mar. 31, 2020	$ 550,607		174,709	$ 230	858,203	246,778	(729,313)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock granted, net of amortization	423			1	422
Stock Repurchased During Period, Value	(166)				(166)
Stock issuance costs	(8)				(8)
Net (loss) income	194,838
Dividends on preferred stock	(3,253)						(3,253)
Dividends on common stock	(9,925)						(9,925)
Other Comprehensive Income (Loss), Net of Tax	(165,047)					(165,047)
Balance at Jun. 30, 2020	$ 567,469		$ 174,709	$ 231	$ 858,451	$ 81,731	$ (547,653)