Investments in Real Estate (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Investments [Abstract]
Closing costs	$ 1,200
Business Acquisition, Purchase Price Allocation, Real Estate [Abstract]
Land	13,286	$ 70,609
Building and improvements	229,386	227,458
Below market leasehold interests	2,698	98
Above market leases	1,254	1,708
In place leases	22,414	22,233
Below market leases	(8,206)	(953)
Above market leasehold interests	(7,725)
Above market debt, net		(2,664)
Net assets acquired	253,107	318,489
Other, net	1,503	(939)
Aggregate purchase price	$ 254,610	$ 317,550
Weighted average lives of acquired intangible assets	26 years 9 months 21 days	9 years 1 month 6 days
Weighted average lives of acquired intangible liabilities	52 years 5 months 8 days	8 years 6 months