Investments - Schedule of Information about Acquisition Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) Property	Jun. 30, 2019 USD ($) Property
Investments [Abstract]
Number of properties acquired | Property	73	137
Allocation of Purchase Price:
Land and improvements	$ 63,100	$ 96,418
Building and improvements	114,469	175,074
Construction in progress	9,641	5,754
Intangible lease assets	3,094	10,338
Assets acquired	190,304	287,584
Intangible lease liabilities	0	(117)
Liabilities assumed	0	(117)
Purchase price (including acquisition costs)	$ 190,304	$ 287,467