Real Estate Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($) property land_parcel
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Number of properties acquired | property	1
Total purchase price of assets acquired | $	$ 19,952
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Number of properties acquired | property		10
Development projects in progress | land_parcel		6
Total purchase price of assets acquired | $		$ 7,627