Commitments and Contingencies - Narrative (Details) $ in Thousands		6 Months Ended
	Aug. 04, 2020 USD ($) ft² a property letter_of_intent	Jun. 30, 2020 USD ($) ft² property
Third-party seller
Other Commitments [Line Items]
Number of properties		0
Area of real estate property | ft²		0
Purchase price | $		$ 7,275
Third-party seller | Seattle
Other Commitments [Line Items]
Number of properties		0
Area of real estate property | ft²		0
Purchase price | $		$ 7,275
Third-party seller | Subsequent event
Other Commitments [Line Items]
Number of nonbinding letters of intent | letter_of_intent	2
Purchase price | $	$ 22,700
Improved land parcels
Other Commitments [Line Items]
Number of properties		22
Area of real estate property | ft²		13,100,000
Improved land parcels | Third-party seller | Subsequent event
Other Commitments [Line Items]
Outstanding contracts with a third-party	1
Number of properties	1
Area of real estate property | a	4.7
Improved land parcels | Third-party seller | Subsequent event | Seattle
Other Commitments [Line Items]
Number of properties	1
Area of real estate property | a	7.0
Industrial building | Third-party seller | Subsequent event
Other Commitments [Line Items]
Area of real estate property | ft²	13,000