Real Estate Investments - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017 property	Jun. 30, 2017 USD ($) land_parcel property	Jun. 30, 2016 USD ($) property
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Number of properties acquired | property		54
Number of land parcels acquired | land_parcel		3
Total purchase price of assets acquired | $		$ 204,438
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 | $		$ 1,300
Bob Evans [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired | property	22