Investment in Real Estate Fair Value Measurement on Non-Recurring Basis (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Property
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Impairment	$ (471)
Fair Value, Measurements, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Land Parcel Held For Sale	1,889
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Land Parcel Held For Sale	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Land Parcel Held For Sale	0
Fair Value, Measurements, Nonrecurring | Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Land Parcel Held For Sale	$ 1,889
Impairment Activity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Land Parcels | Property	1