Acquired In-Place Leases and Above/Below Market Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of acquired above and below market leases	$ 2.8	$ 2.4	$ (0.2)
Weighted-average amortization period of below market leases	8 years 6 months
Acquired lease, below market renewal options	$ 17.5
Weighted-average amortization period of acquired leases prior to the commencement of renewal option	10 years 9 months
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	2 years 5 months
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	1 year 5 months