Related Party Transactions (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016 ft² property	Sep. 30, 2016 USD ($) ft² director	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² director	Sep. 30, 2015 USD ($)	Jul. 31, 2016 ft² property
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²		10,100,000		10,100,000
Number of directors (in directors) | director		1		1
Affiliated Entities | Supervisory Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties		$ 300	$ 500	$ 1,100	$ 1,400
Affiliated Entities | Property Management Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties		100	100	300	200
Affiliated Entities | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties		$ 70	$ 60	200	$ 200
Area of real estate property (in sqft) | ft²						3,074
Number of properties (in property) | property	1					1
Lease cancellation, notice period	90 days
Affiliated Entities | Annualized rent revenue
Related Party Transaction [Line Items]
Revenue from related parties				$ 5,700
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	5,351					647