Investments in Real Estate and Real Estate Under Construction - Summary of acquisitions and build-to-suit transactions (Details) - Industrial property [Member] - Detroit, Michigan [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Investments in Real Estate and Real Estate Under Construction [Line Items]
Initial cost basis	$ 29,697
Land and land estate	1,133
Building and improvements	25,009
Lease in-place value intangible	$ 3,555