CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative effect of adoption of new accounting principle	Stockholders' equity, adjusted balance	Common Stock	Common Stock Stockholders' equity, adjusted balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative effect of adoption of new accounting principle	Additional Paid-in Capital Stockholders' equity, adjusted balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Stockholders' equity, adjusted balance	Cumulative Earnings	Cumulative Earnings Cumulative effect of adoption of new accounting principle	Cumulative Earnings Stockholders' equity, adjusted balance	Cumulative Distributions to Stockholders	Cumulative Distributions to Stockholders Stockholders' equity, adjusted balance
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018	43,621,174			43,621,174	43,621,174
Stockholders’ equity at beginning of period at Dec. 31, 2018	$ 827,531	$ 0	$ 827,531	$ 436	$ 436	$ 836,288	$ 13	$ 836,301	$ (192)	$ (192)	$ 91,875	$ (13)	$ 91,862	$ (100,876)	$ (100,876)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	16,969										16,969
Other comprehensive income before reclassifications	192								192
Amounts reclassified from accumulated other comprehensive income	0								0
Net other comprehensive income	192								192
Issuance of common stock, net of offering costs (in shares)				8,291,829
Issuance of common stock, net of offering costs	157,228			$ 83		157,145
Common dividends declared	(21,913)													(21,913)
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				258,918
Non-cash equity award compensation	1,149			$ 3		1,146
Common shares outstanding at end of period (in shares) at Mar. 31, 2019				52,171,921
Stockholders’ equity at end of period at Mar. 31, 2019	$ 981,131			$ 522		994,592			0		108,831			(122,814)
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018	43,621,174			43,621,174	43,621,174
Stockholders’ equity at beginning of period at Dec. 31, 2018	$ 827,531	0	827,531	$ 436	$ 436	836,288	$ 13	836,301	(192)	(192)	91,875	(13)	91,862	(100,876)	(100,876)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	52,538
Amounts reclassified from accumulated other comprehensive income	0
Net other comprehensive income	$ 224
Issuance of common stock, net of offering costs (in shares)	10,954,924
Non-cash equity award compensation (in shares)	277,107
Common shares outstanding at end of period (in shares) at Sep. 30, 2019	54,853,205			54,853,205
Stockholders’ equity at end of period at Sep. 30, 2019	$ 1,023,240			$ 549		1,047,200			32		144,400			(168,941)
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2019				52,171,921
Stockholders’ equity at beginning of period at Mar. 31, 2019	981,131			$ 522		994,592			0		108,831			(122,814)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	18,177										18,177
Other comprehensive income before reclassifications	32								32
Amounts reclassified from accumulated other comprehensive income	0								0
Net other comprehensive income	32								32
Issuance of common stock, net of offering costs (in shares)				2,663,095
Issuance of common stock, net of offering costs	50,177			$ 27		50,150
Common dividends declared	(23,039)													(23,039)
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				18,189
Non-cash equity award compensation	1,283			$ 0		1,283
Common shares outstanding at end of period (in shares) at Jun. 30, 2019				54,853,205
Stockholders’ equity at end of period at Jun. 30, 2019	1,027,736			$ 549		1,046,025			32		127,008			(145,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	17,392										17,392
Other comprehensive income before reclassifications	0								0
Amounts reclassified from accumulated other comprehensive income	0								0
Net other comprehensive income	0								0
Issuance of common stock, net of offering costs (in shares)				0
Issuance of common stock, net of offering costs	0			$ 0		0
Common dividends declared	(23,038)													(23,038)
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				0
Non-cash equity award compensation	$ 1,175			$ 0		1,175
Common shares outstanding at end of period (in shares) at Sep. 30, 2019	54,853,205			54,853,205
Stockholders’ equity at end of period at Sep. 30, 2019	$ 1,023,240			$ 549		1,047,200			32		144,400			(168,941)
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2019	54,853,205			54,853,205
Stockholders’ equity at beginning of period at Dec. 31, 2019	$ 1,019,136	(18,472)	1,000,664	$ 549	549	1,048,484		1,048,484	32	32	162,076	(18,472)	143,604	(192,005)	(192,005)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(37,191)										(37,191)
Other comprehensive income before reclassifications	(4,511)								(4,511)
Amounts reclassified from accumulated other comprehensive income	767								767
Net other comprehensive income	(3,744)								(3,744)
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				283,680
Non-cash equity award compensation	1,355			$ 3		1,352
Common shares outstanding at end of period (in shares) at Mar. 31, 2020				55,136,885
Stockholders’ equity at end of period at Mar. 31, 2020	$ 961,059			$ 552		1,049,836			(3,712)		106,413			(192,030)
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2019	54,853,205			54,853,205
Stockholders’ equity at beginning of period at Dec. 31, 2019	$ 1,019,136	$ (18,472)	$ 1,000,664	$ 549	$ 549	1,048,484		$ 1,048,484	32	$ 32	162,076	$ (18,472)	$ 143,604	(192,005)	$ (192,005)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(63,590)
Net other comprehensive income	$ 0
Issuance of common stock, net of offering costs (in shares)	0
Non-cash equity award compensation (in shares)	351,877
Common shares outstanding at end of period (in shares) at Sep. 30, 2020	55,205,082			55,205,082
Stockholders’ equity at end of period at Sep. 30, 2020	$ 934,462			$ 552		1,057,016			0		80,014			(203,120)
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2020				55,136,885
Stockholders’ equity at beginning of period at Mar. 31, 2020	961,059			$ 552		1,049,836			(3,712)		106,413			(192,030)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(1,733)										(1,733)
Other comprehensive income before reclassifications	4,223								4,223
Amounts reclassified from accumulated other comprehensive income	(511)								(511)
Net other comprehensive income	3,712								3,712
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				68,197
Non-cash equity award compensation	1,323			$ 0		1,323
Common shares outstanding at end of period (in shares) at Jun. 30, 2020				55,205,082
Stockholders’ equity at end of period at Jun. 30, 2020	964,336			$ 552		1,051,159			0		104,680			(192,055)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(24,666)										(24,666)
Other comprehensive income before reclassifications	0								0
Amounts reclassified from accumulated other comprehensive income	0								0
Net other comprehensive income	0								0
Issuance of common stock, net of offering costs (in shares)				0
Issuance of common stock, net of offering costs	0			$ 0		0
Issuance of warrants to purchase common stock	4,541					4,541
Common dividends declared	(11,040)													(11,040)
Preferred dividends declared	(25)													(25)
Non-cash equity award compensation (in shares)				0
Non-cash equity award compensation	$ 1,316			$ 0		1,316
Common shares outstanding at end of period (in shares) at Sep. 30, 2020	55,205,082			55,205,082
Stockholders’ equity at end of period at Sep. 30, 2020	$ 934,462			$ 552		$ 1,057,016			$ 0		$ 80,014			$ (203,120)