Investment in Real Estate Investment in Real Estate - Summary of Industrial Property Acquisitions (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) ft² Property	Dec. 31, 2019 USD ($) ft² Property	Dec. 31, 2018 USD ($) ft² Property
Real Estate Properties [Line Items]
Number of industrial properties | Property	427
Gross leasable area (GLA) of industrial properties | ft²	62.8
Acquisition Activity
Real Estate Properties [Line Items]
Number of industrial properties | Property	8	9	10
Gross leasable area (GLA) of industrial properties | ft²	1.5	0.5	1.0
Purchase price of industrial properties acquired | $	$ 224,027	$ 147,887	$ 167,546
Purchase price of land parcels acquired | $	$ 69,617	$ 81,082	$ 38,976