Real Estate Investments and Related Intangibles - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Acquired intangible assets:
Below market lease, weighted average useful life	19 years
Acquisition, 2019 [Member]
Real estate investments, at cost:
Land	$ 40,460
Buildings, fixtures and improvements	135,182
Total tangible assets	175,642
Acquired intangible assets:
Total purchase price of assets acquired	200,459
Capitalized acquisition costs	1,000
Acquisition, 2019 [Member] | In-place leases and other intangible assets [Member]
Acquired intangible assets:
Acquired intangible assets	$ 24,817
Weighted-Average Useful Life	15 years 9 months 18 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		$ 37,732
Buildings, fixtures and improvements		121,310
Total tangible assets		159,042
Acquired intangible assets:
Total purchase price of assets acquired		181,240
Capitalized acquisition costs		1,100
Acquisitions 2018 [Member] | In-place leases and other intangible assets [Member]
Acquired intangible assets:
Acquired intangible assets		$ 19,564
Weighted-Average Useful Life		13 years 10 months 24 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	16,400
Capitalized acquisition costs	$ 500