Related Party Transactions (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) ft² property	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) ft² property	Jun. 30, 2015 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	10,100,000		10,100,000
Affiliated Entities | Supervisory Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties	$ 400	$ 500	$ 800	$ 900
Affiliated Entities | Property Management Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties	100	100	200	200
Affiliated Entities | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties	$ 50	$ 50	$ 100	$ 100
Area of real estate property (in sqft) | ft²	3,074		3,074
Number of properties (in property) | property	1		1
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	647		647