Real Estate Investments (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
2016 Acquisitions [Member]
Real estate investments, at cost:
Land	$ 4,215
Buildings, fixtures and improvements	14,555
Total tangible assets	18,770
Assumed intangible liabilities:
Total purchase price of assets acquired	19,952
2016 Acquisitions [Member] | In-place leases [Member]
Acquired intangible assets:
Acquired intangible assets	1,182
2016 Acquisitions [Member] | Above-market leases [Member]
Acquired intangible assets:
Acquired intangible assets	0
2016 Acquisitions [Member] | Below-market leases [Member]
Assumed intangible liabilities:
Below-market leases	$ 0
2015 Acquisitions [Member]
Real estate investments, at cost:
Land		$ 4,187
Buildings, fixtures and improvements		5,258
Total tangible assets		9,445
Assumed intangible liabilities:
Total purchase price of assets acquired		10,207
2015 Acquisitions [Member] | In-place leases [Member]
Acquired intangible assets:
Acquired intangible assets		717
2015 Acquisitions [Member] | Above-market leases [Member]
Acquired intangible assets:
Acquired intangible assets		153
2015 Acquisitions [Member] | Below-market leases [Member]
Assumed intangible liabilities:
Below-market leases		$ (108)