Variable Interest Entities Variable Interest Entities - Additional Information (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($) ft² Property	Dec. 31, 2018 USD ($) ft²
Variable Interest Entity [Line Items]
Net Income	$ 200,169	$ 243,881	$ 167,334
Gross leasable area (GLA) of industrial properties owned | ft²	62.8
Equity in Income (Loss) of Joint Ventures	$ 4,200	16,235	$ (276)
Joint Venture I
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Equity in Income (Loss) of Joint Ventures	$ 2,674	4,880
Incentive Fee	$ 1,338
Joint Venture II
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage	43.00%
Purchase Price	$ 70,530
Joint Ventures
Variable Interest Entity [Line Items]
Net Income	13,568	29,999
Equity Method Investment, Realized Gain (Loss) on Disposal	6,827	14,816
Asset Management Fee	590	146
Receivable balance due from joint venture	$ 90	$ 588
Disposition Activity
Variable Interest Entity [Line Items]
Gross leasable area (GLA) of industrial properties owned | ft²	1.9	5.9	2.6
Disposition Activity | Joint Ventures
Variable Interest Entity [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 13,932	$ 30,236
Acquisition Activity
Variable Interest Entity [Line Items]
Purchase Price	$ 224,027	$ 147,887	$ 167,546
Gross leasable area (GLA) of industrial properties owned | ft²	1.5	0.5	1.0
Acquisition Activity | Joint Venture I
Variable Interest Entity [Line Items]
Gross leasable area (GLA) of industrial properties owned | ft²	0.6
Number of Acres | Property		39
Joint Venture Disposition Activity | Joint Venture I
Variable Interest Entity [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 3,443	$ 3,121