Real Estate Investments (Summary of Amortization Expense and Adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of leases			$ 17,291	$ 17,300
Depreciation and Amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of leases	$ 8,613	$ 8,650	17,291	17,300
Depreciation and Amortization | In-place leases
Finite-Lived Intangible Assets [Line Items]
Amortization of leases	8,613	8,650	17,291	17,300
Rental Income
Finite-Lived Intangible Assets [Line Items]
Amortization (accretion) of leases	(120)	(417)	(535)	(833)
Rental Income | Above-market leases
Finite-Lived Intangible Assets [Line Items]
Amortization of leases	740	752	1,496	1,503
Rental Income | Below market leases
Finite-Lived Intangible Assets [Line Items]
Accretion of leases	620	335	961	670
Property Operating Expense
Finite-Lived Intangible Assets [Line Items]
Accretion of leases	1	0	1	0
Property Operating Expense | Above-market ground leases
Finite-Lived Intangible Assets [Line Items]
Accretion of leases	$ 1	$ 0	$ 1	$ 0