Real Estate Investments, Net (Acquired Assets) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($) property
Real estate investments, at cost:
Weighted-average remaining amortization periods	3 years	5 years 7 months 6 days
Individual business acquisitions
Real estate investments, at cost:
Land	$ 6,900	$ 2,827
Buildings, fixtures and improvements	86,687	26,022
Development costs	0	2,261
Total tangible assets	93,587	31,110
Market lease liabilities	(362)	(821)
Total intangible assets and liabilities	9,495	1,978
Mortgage notes payable, net	13,883	0
Other assets acquired and liabilities assumed in the Asset Acquisition, net	1,786	0
Cash paid for real estate investments, including acquisitions	$ 90,985	$ 33,088
Number of properties purchased | property	8	3
Individual business acquisitions | In-place leases
Real estate investments, at cost:
In-place leases, market leases, and other intangible assets	$ 9,385	$ 2,768
Individual business acquisitions | Market lease and other intangible assets
Real estate investments, at cost:
In-place leases, market leases, and other intangible assets	$ 472	$ 31