Investments in Real Estate - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) a ft² property	Dec. 31, 2021 USD ($) a ft² property	Dec. 31, 2020 USD ($) ft² building property	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets
Number of properties (property) | property	253	253
Capitalized interest associated with redevelopment activities		$ 700	$ 1,600	$ 3,200
Rental revenues and tenant expense reimbursements		221,930	186,884	171,022
Net income		$ 87,254	79,795	$ 55,516
Redevelopment property
Finite-Lived Intangible Assets
Number of properties (property) | property	4	4
Asset acquisition, consideration transferred		$ 75,800
Redevelopment property | Sodo Row - North & South
Finite-Lived Intangible Assets
Asset acquisition, property additions	$ 62,800
Area of real estate property | ft²	200,000	200,000
Redevelopment property | Scenario, Plan
Finite-Lived Intangible Assets
Number of properties (property) | property	2	2
Area of real estate property | ft²	200,000	200,000
Improved land parcels
Finite-Lived Intangible Assets
Number of properties (property) | property	36	36
Area of real estate property | ft²	15,100,000	15,100,000
Area of land | a	127.1	127.1
Improved land parcels | Scenario, Plan
Finite-Lived Intangible Assets
Number of properties (property) | property	2	2
Area of land | a	12.1	12.1
Asset Acquisitions 2021
Finite-Lived Intangible Assets
Capitalized interest associated with redevelopment activities		$ 12,600
Rental revenues and tenant expense reimbursements		12,600
Net income		$ 4,000
Asset Acquisitions 2021 | Wholly Owned Properties
Finite-Lived Intangible Assets
Area of real estate property | ft²	1,895,024	1,895,024
Area of land | a	52.5	52.5
Asset acquisition, consideration transferred		$ 657,345
Asset Acquisitions 2021 | Industrial building
Finite-Lived Intangible Assets
Number of properties (property) | property	34	34
Asset acquisitions, assets acquired and liabilities assumed, net		$ 682,000
Finite-lived intangible assets acquired		28,900
Asset acquisition, liabilities		37,400
Asset acquisition, intangible liabilities		34,200
Capital expenditures in other credits		$ 22,100
Asset Acquisitions 2021 | Industrial building | Wholly Owned Properties
Finite-Lived Intangible Assets
Number of properties (property) | property	34	34
Asset Acquisitions 2021 | Land | Industrial building
Finite-Lived Intangible Assets
Asset acquisition, property additions		$ 446,300
Asset Acquisitions 2021 | Building | Industrial building
Finite-Lived Intangible Assets
Asset acquisition, property additions		$ 206,800
Asset Acquisitions 2020
Finite-Lived Intangible Assets
Asset acquisitions, assets acquired and liabilities assumed, net			100,400
Asset acquisition, property additions			78,800
Finite-lived intangible assets acquired			4,600
Asset acquisition, liabilities			2,200
Capitalized interest associated with redevelopment activities			1,600
Rental revenues and tenant expense reimbursements			2,400
Net income			$ 1,100
Asset Acquisitions 2020 | Wholly Owned Properties
Finite-Lived Intangible Assets
Number of properties (property) | building			6
Area of real estate property | ft²			163,794
Area of land | ft²			12.0
Asset acquisition, consideration transferred			$ 96,657
Asset Acquisitions 2020 | Industrial building
Finite-Lived Intangible Assets
Number of properties (property) | property			11
Asset acquisition, property additions			$ 17,000