Operating assets that are independent of the Operating Partnership.

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Real estate cost capitalized excluding interest cost.

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Summary Of Significant Accounting Policies [Line Items]

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The amount of transaction cost incurred during the sale of real estate investments.

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Number of unconsolidated entities considered as a VIE for which entity is not the primary beneficiary.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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Amount of interest capitalized during the period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Summary of Significant Accounting Policies - (Basis of Presentation to Real Estate Assets) (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($) entity	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) entity	Jun. 30, 2019 USD ($)	Nov. 08, 2017	Jul. 23, 2014
Summary Of Significant Accounting Policies [Line Items]
Operating assets independent of the Operating Partnership	$ 0			$ 0
Number of unconsolidated entities considered as a VIE for which entity is not the primary beneficiary \| entity	1			1
Maximum exposure to losses	$ 27,800,000			$ 27,800,000
Depreciation expense from operation	38,000,000.0	$ 32,400,000		73,700,000	$ 62,800,000
Real estate cost capitalized excluding interest cost	4,800,000	4,000,000.0		9,300,000	8,500,000
Real estate interest cost capitalized incurred	7,700,000	8,400,000		15,800,000	16,200,000
Gain on sale of real estate, net					13,408,000
Qualitytech, LP
Summary Of Significant Accounting Policies [Line Items]
Operating assets independent of the Operating Partnership	0			$ 0
Gain on sale of real estate, net					13,408,000
Real Property
Summary Of Significant Accounting Policies [Line Items]
Useful life of property				40 years
Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation	34,700,000	29,500,000		$ 67,000,000	57,000,000.0
Non-Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation	$ 3,300,000	$ 2,900,000		$ 6,700,000	$ 5,800,000
Minimum \| Real Property
Summary Of Significant Accounting Policies [Line Items]
Useful life of property				20 years
Maximum \| Real Property
Summary Of Significant Accounting Policies [Line Items]
Useful life of property				40 years
Maximum \| Leasehold Improvements
Summary Of Significant Accounting Policies [Line Items]
Useful life of property				20 years
Senior Notes
Summary Of Significant Accounting Policies [Line Items]
Interest rate	4.75%			4.75%		4.75%	5.875%
Unconsolidated Affiliate [Member] \| Manassas, Virginia
Summary Of Significant Accounting Policies [Line Items]
Gain on sale of real estate, net			$ 13,400,000
Transaction cost			$ 5,800,000