Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Distributions in Excess of Cumulative Earnings	Distributions in Excess of Cumulative Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total Stockholders' Equity	Total Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Non-Controlling Interests	Non-Controlling Interests Cumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2018	$ 811,041		$ 431	$ 569,407	$ (7,659)		$ 0	$ 562,179		$ 248,862
Balance (in shares) at Dec. 31, 2018			43,749,092
Common stock issuance	245,525		$ 140	245,385				245,525
Common stock issuance (in shares)			14,030,000
Costs related to issuance of common stock	(10,887)			(10,887)				(10,887)
Share-based compensation expense	1,007			1,007				1,007
Share-based compensation expense (in shares)			46,368
Unit-based compensation expense	227			227				227
Dividends declared on common stock and OP Units	(16,145)				(12,143)			(12,143)		(4,002)
Net income	8,723				6,129			6,129		2,594
Balance at Mar. 31, 2019	1,039,491		$ 571	805,139	(13,673)		0	792,037		247,454
Balance (in shares) at Mar. 31, 2019			57,825,460
Balance at Dec. 31, 2018	811,041		$ 431	569,407	(7,659)		0	562,179		248,862
Balance (in shares) at Dec. 31, 2018			43,749,092
Net income	19,294
Balance at Jun. 30, 2019	1,030,516		$ 578	806,376	(18,447)		(2,913)	785,594		244,922
Balance (in shares) at Jun. 30, 2019			57,825,460
Balance at Dec. 31, 2018	811,041		$ 431	569,407	(7,659)		0	562,179		248,862
Balance (in shares) at Dec. 31, 2018			43,749,092
Balance at Dec. 31, 2019	$ 1,202,113	$ (188)	$ 838	1,223,043	(27,482)	$ (187)	(1,949)	1,194,450	$ (187)	7,663	$ (1)
Balance (in shares) at Dec. 31, 2019	83,761,151		83,761,151
Accounting standards update	us-gaap:AccountingStandardsUpdate201613Member
Balance at Mar. 31, 2019	$ 1,039,491		$ 571	805,139	(13,673)		0	792,037		247,454
Balance (in shares) at Mar. 31, 2019			57,825,460
Unrealized losses on cash flow hedges	(3,774)						(2,839)	(2,839)		(935)
Cash flow hedge losses (gains) reclassified to interest expense	(99)						(74)	(74)		(25)
Share-based compensation expense	1,028		$ 7	1,021				1,028
Unit-based compensation expense	216			216				216
Dividends declared on common stock and OP Units	(16,917)				(12,725)			(12,725)		(4,192)
Net income	10,571				7,951			7,951		2,620
Balance at Jun. 30, 2019	1,030,516		$ 578	806,376	(18,447)		(2,913)	785,594		244,922
Balance (in shares) at Jun. 30, 2019			57,825,460
Balance at Dec. 31, 2019	$ 1,202,113	(188)	$ 838	1,223,043	(27,482)	(187)	(1,949)	1,194,450	(187)	7,663	(1)
Balance (in shares) at Dec. 31, 2019	83,761,151		83,761,151
Common stock issuance	$ 206,238		$ 81	206,157				206,238
Common stock issuance (in shares)			8,188,698
Costs related to issuance of common stock	(8,539)			(8,539)				(8,539)
Unrealized losses on cash flow hedges	(38,432)						(38,201)	(38,201)		(231)
Cash flow hedge losses (gains) reclassified to interest expense	332						330	330		2
Share-based compensation expense	1,508			1,508				1,508
Dividends declared on common stock and OP Units	(21,295)				(21,168)			(21,168)		(127)
Net income	14,043				13,959			13,959		84
Balance at Mar. 31, 2020	1,355,780		$ 919	1,422,169	(34,878)		(39,820)	1,348,390		7,390
Balance (in shares) at Mar. 31, 2020			91,949,849
Balance at Dec. 31, 2019	$ 1,202,113	$ (188)	$ 838	1,223,043	(27,482)	$ (187)	(1,949)	1,194,450	$ (187)	7,663	$ (1)
Balance (in shares) at Dec. 31, 2019	83,761,151		83,761,151
Net income	$ 24,488
Balance at Jun. 30, 2020	$ 1,358,383		$ 930	1,440,828	(45,915)		(44,758)	1,351,085		7,298
Balance (in shares) at Jun. 30, 2020	93,024,022		93,024,022
Balance at Mar. 31, 2020	$ 1,355,780		$ 919	1,422,169	(34,878)		(39,820)	1,348,390		7,390
Balance (in shares) at Mar. 31, 2020			91,949,849
Common stock issuance	17,332		$ 11	17,321				17,332
Common stock issuance (in shares)			1,074,173
Costs related to issuance of common stock	(491)			(491)				(491)
Unrealized losses on cash flow hedges	(6,459)						(6,421)	(6,421)		(38)
Cash flow hedge losses (gains) reclassified to interest expense	1,492						1,483	1,483		9
Share-based compensation expense	1,829			1,829				1,829
Dividends declared on common stock and OP Units	(21,544)				(21,418)			(21,418)		(126)
Net income	10,444				10,381			10,381		63
Balance at Jun. 30, 2020	$ 1,358,383		$ 930	$ 1,440,828	$ (45,915)		$ (44,758)	$ 1,351,085		$ 7,298
Balance (in shares) at Jun. 30, 2020	93,024,022		93,024,022