Deferred Financing and Leasing Costs (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Unamortized market value intangible liabilities	$ 4.4	$ 6.1
Amortization of above and below Market Leases	$ (1.6)	$ (1.9)	$ (2.8)
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period	3 years 8 months
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period	4 years 7 months 2 days