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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands									1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 01, 2019	Jul. 30, 2019	Jul. 17, 2019	Jul. 01, 2019	Jun. 12, 2019	Jun. 03, 2019	Apr. 29, 2019	Sep. 20, 2017	Aug. 14, 2019	Aug. 12, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Aug. 08, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Proceeds from issuance of private placement								$ 2,200,000
Common stock issued pursuant to the distribution reinvestment plan													$ 15,479	$ 22,653
Dividends per share declared (in usd per share)					$ 0.001506849		$ 0.001506849				$ 0.16	$ 0.17	$ 0.33	$ 0.34
Stock distributions (in shares per day)					0.000273973		0.000273973
Dividends per share paid (in usd per share)						$ 0.001780822
Proceeds from disposition of properties													$ 0	$ 1,383
Carrying value of real estate											$ 3,751,061		3,751,061			$ 2,534,952
Land											$ 486,345		$ 486,345			$ 350,470
Heritage Common X
Subsequent Event [Line Items]
Equity method investment, ownership (percent)											45.00%		45.00%
Private Offering
Subsequent Event [Line Items]
Proceeds from issuance of private placement								2,000,000					$ 2,700,000
Distribution Reinvestment Plan
Subsequent Event [Line Items]
Proceeds from issuance of private placement								$ 200,000
Subsequent Event
Subsequent Event [Line Items]
Dividends per share paid (in usd per share)	$ 0.001506849			$ 0.001506849
Stock distributions paid, per day's worth (shares)	0.000273973			0.000273973
Subsequent Event | Heritage Trace Parkway Property
Subsequent Event [Line Items]
Proceeds from disposition of properties									$ 7,000
Carrying value of real estate			$ 3,300
Gains on sale			$ 3,700
Subsequent Event | Lynnwood IV
Subsequent Event [Line Items]
Gains on sale		$ 300
Proceeds from sale of real estate		1,600
Land		$ 1,300
Subsequent Event | Private Offering
Subsequent Event [Line Items]
Number of shares issued (in shares)										1,058,843
Proceeds from issuance of private placement										$ 0
Subsequent Event | Distribution Reinvestment Plan
Subsequent Event [Line Items]
Number of shares issued (in shares)										28,523,643
Common stock issued pursuant to the distribution reinvestment plan										$ 276,900
Subsequent Event | Share Redemption Program | Minimum
Subsequent Event [Line Items]
Minimum aggregate NAV that can be redeemed (percent)															5.00%

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