Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Preferred Stock Including Additional Paid in Capital	Additional Paid-in Capital	Accumulated Other Comprehensive 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		20,319	15,133
Restricted stock granted, net of amortization			58,745
Adjustments for tax withholding on share-based compensation			19,045
Balance, Preferred shares outstanding at Mar. 31, 2018		5,908,999
Balance, Common shares outstanding at Mar. 31, 2018			18,665,349
Balance at Dec. 31, 2017	$ 557,058		$ 186	$ 141,294	$ 776,245	$ (8,697)	$ (351,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	788		0	494	294
Restricted stock granted, net of amortization	335		1		334
Adjustments for tax withholding on share-based compensation	(364)		0		(364)
Stock issuance costs	(19)				(19)
Net loss	44,307						44,307
Dividends on preferred stock	(2,940)						(2,940)
Dividends on common stock	(10,079)						(10,079)
Other comprehensive income	(45,462)					(45,462)
Balance at Mar. 31, 2018	543,624		$ 187	141,788	776,490	(54,159)	(320,682)
Balance, Preferred shares outstanding at Dec. 31, 2017		5,888,680
Balance, Common shares outstanding at Dec. 31, 2017			18,610,516
Balance, Preferred shares outstanding at Sep. 30, 2018		5,941,659
Balance, Common shares outstanding at Sep. 30, 2018			19,672,185
Balance at Dec. 31, 2017	557,058		$ 186	141,294	776,245	(8,697)	(351,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	85,545
Net loss	85,545
Preferred Stock Dividends, Income Statement Impact	8,838
Other comprehensive income	(77,136)
Balance at Sep. 30, 2018	546,753		$ 197	142,574	796,023	(85,833)	(306,208)
Balance, Preferred shares outstanding at Mar. 31, 2018		5,908,999
Balance, Common shares outstanding at Mar. 31, 2018			18,665,349
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance		0	291,076
Restricted stock granted, net of amortization			12,308
Balance, Preferred shares outstanding at Jun. 30, 2018		5,908,999
Balance, Common shares outstanding at Jun. 30, 2018			18,968,733
Balance at Mar. 31, 2018	543,624		$ 187	141,788	776,490	(54,159)	(320,682)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	5,620		3	0	5,617
Restricted stock granted, net of amortization	294		0		294
Stock issuance costs	(11)				(11)
Net loss	15,652						15,652
Dividends on preferred stock	(2,942)						(2,942)
Dividends on common stock	(10,243)						(10,243)
Other comprehensive income	(9,760)					(9,760)
Balance at Jun. 30, 2018	542,234		$ 190	141,788	782,390	(63,919)	(318,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance		32,660	703,452
Restricted stock granted, net of amortization			0
Balance, Preferred shares outstanding at Sep. 30, 2018		5,941,659
Balance, Common shares outstanding at Sep. 30, 2018			19,672,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	14,163		$ 7	796	13,360
Restricted stock granted, net of amortization	301		0		301
Stock issuance costs	(38)			(10)	(28)
Net Income (Loss) Attributable to Parent							25,586
Net loss	25,586
Preferred Stock Dividends, Income Statement Impact							2,956
Dividends on preferred stock	(2,956)
Dividends on common stock	(10,623)						(10,623)
Other comprehensive income	(21,914)
Balance at Sep. 30, 2018	$ 546,753		$ 197	142,574	796,023	(85,833)	(306,208)
Balance, Preferred shares outstanding at Dec. 31, 2018	5,954,594	5,954,594
Balance, Common shares outstanding at Dec. 31, 2018	20,939,072		20,939,073
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance		213,468	3,109,047
Restricted stock granted, net of amortization			50,821
Adjustments for tax withholding on share-based compensation			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		$ 209	142,883	818,861	(35,779)	(399,021)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	58,887		31	5,015	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	(52,214)						(52,214)
Dividends on preferred stock	(3,059)						(3,059)
Dividends on common stock	(12,350)						(12,350)
Other comprehensive income	86,467					86,467
Balance at Mar. 31, 2019	$ 604,674		$ 241	147,898	872,491	50,688	(466,644)
Balance, Preferred shares outstanding at Dec. 31, 2018	5,954,594	5,954,594
Balance, Common shares outstanding at Dec. 31, 2018	20,939,072		20,939,073
Balance, Preferred shares outstanding at Sep. 30, 2019	6,788,330	6,788,330
Balance, Common shares outstanding at Sep. 30, 2019	22,945,993		22,945,993
Balance at Dec. 31, 2018	$ 527,153		$ 209	142,883	818,861	(35,779)	(399,021)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	(207,803)
Net loss	(207,803)
Preferred Stock Dividends, Income Statement Impact	9,606
Other comprehensive income	252,789
Balance at Sep. 30, 2019	584,447		$ 229	162,807	858,050	217,010	(653,649)
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		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		$ 241	147,898	872,491	50,688	(466,644)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	18,052		5	8,173	9,874
Restricted stock granted, net of amortization	296		0		296
Stock issuance costs	(28)				(28)
Net loss	(118,985)						(118,985)
Dividends on preferred stock	(3,206)						3,206
Dividends on common stock	(13,292)						(13,292)
Other comprehensive income	111,127					111,127
Balance at Jun. 30, 2019	$ 598,638		$ 246	156,071	882,633	161,815	(602,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance		274,200	8,300
Restricted stock granted, net of amortization			0
Stock repurchase			(1,709,271)
Balance, Preferred shares outstanding at Sep. 30, 2019	6,788,330	6,788,330
Balance, Common shares outstanding at Sep. 30, 2019	22,945,993		22,945,993
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance	$ 6,873		$ 0	6,736	137
Restricted stock granted, net of amortization	306		0		306
Stock repurchase	(25,034)		17		25,017
Stock issuance costs	(9)				(9)
Net Income (Loss) Attributable to Parent	(36,604)
Net loss	(36,604)						(36,604)
Preferred Stock Dividends, Income Statement Impact	3,341
Dividends on preferred stock	(3,341)						3,341
Dividends on common stock	(11,577)						(11,577)
Other comprehensive income	55,195					55,195
Balance at Sep. 30, 2019	$ 584,447		$ 229	$ 162,807	$ 858,050	$ 217,010	$ (653,649)