Acquired In-Place Leases and Above/Below Market Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of acquired above and below market leases	$ 3.6	$ 3.3	$ 3.5
Weighted-average amortization period of below market leases	5 years 11 months
Acquired lease, below market renewal options	$ 14.6
Weighted-average amortization period of acquired leases prior to the commencement of renewal option	8 years 6 months
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	7 years 10 months
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	1 year 2 months