CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Cumulative Earnings	Cumulative Distributions to Stockholders
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017	43,235,103	43,235,103
Stockholders’ equity at beginning of period at Dec. 31, 2017	$ 828,621	$ 432	$ 829,704	$ 0	$ 28,800	$ (30,315)
Net income	14,586				14,586
Other comprehensive income before reclassifications	16			16
Amounts reclassified from accumulated other comprehensive income	0			0
Net other comprehensive income	16			16
Common dividends declared	(16,506)					(16,506)
Preferred dividends declared	(25)					(25)
Non-cash equity award compensation (in shares)		201,956
Non-cash equity award compensation	664	$ 2	662
Common shares outstanding at end of period (in shares) at Mar. 31, 2018		43,437,059
Stockholders’ equity at end of period at Mar. 31, 2018	$ 827,356	$ 434	830,366	16	43,386	(46,846)
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017	43,235,103	43,235,103
Stockholders’ equity at beginning of period at Dec. 31, 2017	$ 828,621	$ 432	829,704	0	28,800	(30,315)
Net income	29,813
Net other comprehensive income	$ 0
Non-cash equity award compensation (in shares)	221,131
Common shares outstanding at end of period (in shares) at Jun. 30, 2018	43,456,234	43,456,234
Stockholders’ equity at end of period at Jun. 30, 2018	$ 826,362	$ 435	831,568	0	58,613	(64,254)
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2018		43,437,059
Stockholders’ equity at beginning of period at Mar. 31, 2018	827,356	$ 434	830,366	16	43,386	(46,846)
Net income	15,227				15,227
Other comprehensive income before reclassifications	(16)			(16)
Amounts reclassified from accumulated other comprehensive income	0			0
Net other comprehensive income	(16)			(16)
Common dividends declared	(17,383)					(17,383)
Preferred dividends declared	(25)					(25)
Non-cash equity award compensation (in shares)		19,175
Non-cash equity award compensation	$ 1,203	$ 1	1,202
Common shares outstanding at end of period (in shares) at Jun. 30, 2018	43,456,234	43,456,234
Stockholders’ equity at end of period at Jun. 30, 2018	$ 826,362	$ 435	831,568	0	58,613	(64,254)
Cumulative effect of adoption of new accounting principle	0		13		(13)
Stockholders' equity at beginning of period, adjusted balance	$ 827,531	$ 436	836,301	(192)	91,862	(100,876)
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018	43,621,174	43,621,174
Stockholders’ equity at beginning of period at Dec. 31, 2018	$ 827,531	$ 436	836,288	(192)	91,875	(100,876)
Net 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
Stockholders’ equity at beginning of period at Dec. 31, 2018	$ 827,531	$ 436	836,288	(192)	91,875	(100,876)
Net income	35,146
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 Jun. 30, 2019	54,853,205	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)
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)
Net 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	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)