Summary of Significant Accounting Policies (Details) $ in Thousands, ft² in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020 USD ($) ft² property state	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) ft² property state
Business Overview:
Gross investment amount, total	$ 4,300,000		$ 4,300,000
Number of real estate properties | property	211		211
Number of states that the company owns real estate in, whole units | state	24		24
Square footage of owned real estate properties | ft²	15.5		15.5
Approximate square feet for which Nationwide property management services provided by company | ft²	11.9		11.9
Deferred rent arrangements for the quarter	$ 100
Aggregate second quarter 2020 tenant billings collected (percent)			99.00%
Scheduled deferral payments collected in the third quarter (percent)	96.00%
Deferred rent receivable, net	$ 1,200		$ 1,200
Second and third quarter 2020 tenant billings deferred under rent deferral agreements (percent)			1.00%
Deferred rent reserve recognized in the period	300	$ 700
Deferred rent, general reserve	400		$ 400
Deferred rent receivable, gross	$ 1,700		$ 1,700