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Commitments and Contingencies - Narrative (Details) $ in Thousands		6 Months Ended
	Jul. 31, 2019 USD ($) a	Jun. 30, 2019 USD ($) ft² property	Jul. 31, 2019 property	Jul. 31, 2019 ft²	Jul. 31, 2019 letter	Jul. 31, 2019 contract
Third-party seller
Other Commitments [Line Items]
Number of buildings		11
Area of real estate property | ft²		360,727
Purchase price | $		$ 120,900
Third-party seller | Subsequent event
Other Commitments [Line Items]
Outstanding contracts with a third-party | contract						6
Third-party purchaser | Subsequent event
Other Commitments [Line Items]
Outstanding contracts with a third-party | contract						1
Los Angeles | Third-party seller
Other Commitments [Line Items]
Number of buildings		7
Area of real estate property | ft²		82,884
Purchase price | $		$ 23,525
Miami | Third-party seller
Other Commitments [Line Items]
Number of buildings		0
Area of real estate property | ft²		0
Purchase price | $		$ 0
Industrial building | Third-party seller | Subsequent event
Other Commitments [Line Items]
Number of buildings			6
Area of real estate property | ft²				361,000
Industrial building | Third-party seller, non-binding letter | Subsequent event
Other Commitments [Line Items]
Area of real estate property | ft²				92,000
Purchase price | $	$ 19,000
Industrial building | Third-party purchaser | Subsequent event
Other Commitments [Line Items]
Number of buildings			1
Sales price | $	14,000
Sales price, book value | $	$ 11,600
Improved land parcels
Other Commitments [Line Items]
Number of buildings		17
Area of real estate property | ft²		13,000,000.0
Improved land parcels | Third-party seller | Subsequent event
Other Commitments [Line Items]
Number of buildings			1
Area of real estate property | a	2.0
Redevelopment property | Third-party seller, non-binding letter | Subsequent event
Other Commitments [Line Items]
Number of buildings			2		2

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- Definition

Asset Acquisition, Contractual Commitment, Assets Acquired and Liabilities Assumed, Net

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- Definition

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