Commitments and Contingencies (Details) $ in Thousands				3 Months Ended	34 Months Ended
	Dec. 18, 2018 ft²	Mar. 29, 2018 ft²	Jan. 11, 2018 USD ($) a ft²	Feb. 28, 2019 USD ($) ft² building	Nov. 30, 2018 USD ($)	Dec. 05, 2018 USD ($) a	Jun. 26, 2018 USD ($) a	Jan. 25, 2016 USD ($) a
Purchase and sale obligations
Area Of Building | ft²		234,000
Number of Buildings | building				2
Agreement to sell
Purchase and sale obligations
Purchase obligations								$ 7,700
Number of acres | a								280
Agreement Extension Fee					$ 260
Purchase agreement
Purchase and sale obligations
Purchase obligations			$ 3,600			$ 900	$ 4,700
Area Of Building | ft²	500,000		156,000
Number of acres | a			14			9	36
Amended purchase agreement
Purchase and sale obligations
Purchase obligations			$ 3,100
Obligations For Investments In Real Estate Assets
Purchase and sale obligations
Purchase obligations				$ 14,249
Area Of Building | ft²				283,000