Real Estate Investments - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property land_parcel	Mar. 31, 2016 USD ($) property
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Number of properties acquired | property	16
Number of land parcels acquired | land_parcel	3
Total purchase price of assets acquired	$ 101,914
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Number of properties acquired | property		1
Total purchase price of assets acquired		$ 19,952
Accounting Standards Update 2017-01 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Business Acquisition [Line Items]
Capitalized acquisition costs	$ 400