Real Estate Investments and Related Intangibles - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Acquired intangible assets:
Below market lease, weighted average useful life	19 years 2 months 12 days
Acquisition, 2019 [Member]
Real estate investments, at cost:
Land	$ 47,749
Buildings, fixtures and improvements	181,904
Total tangible assets	229,653
Acquired intangible assets:
Total purchase price of assets acquired	260,715
Capitalized acquisition costs	1,400
Acquisition, 2019 [Member] | In-place leases and other intangible assets [Member]
Acquired intangible assets:
Acquired intangible assets	$ 31,062
Weighted-Average Useful Life	15 years 2 months 12 days
Acquisition, 2019 [Member] | Above-market leases [Member]
Acquired intangible assets:
Acquired intangible assets	$ 0
Acquisition, 2019 [Member] | Below Market Lease [Member]
Acquired intangible assets:
Assumed intangible liabilities, Below-market leases	0
Acquisitions 2018 [Member]
Real estate investments, at cost:
Land		$ 54,732
Buildings, fixtures and improvements		181,011
Total tangible assets		235,743
Acquired intangible assets:
Total purchase price of assets acquired		280,427
Capitalized acquisition costs		1,600
Acquisitions 2018 [Member] | In-place leases and other intangible assets [Member]
Acquired intangible assets:
Acquired intangible assets		$ 42,050
Weighted-Average Useful Life		15 years 8 months 12 days
Acquisitions 2018 [Member] | Above-market leases [Member]
Acquired intangible assets:
Acquired intangible assets		$ 2,750
Weighted-Average Useful Life		10 years 9 months 18 days
Acquisitions 2018 [Member] | Below Market Lease [Member]
Acquired intangible assets:
Assumed intangible liabilities, Below-market leases		$ (116)
Below market lease, weighted average useful life		9 years 10 months 24 days
Build-to-suit Development Project [Member] | Acquisition, 2019 [Member]
Acquired intangible assets:
Development in process	27,600
Capitalized acquisition costs	$ 700