The number of acres of land acquired.

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- Definition

Operating assets that are independent of the Operating Partnership.

+ References

No definition available.

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- Definition

Real estate cost capitalized excluding interest cost.

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Summary Of Significant Accounting Policies [Line Items]

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- Definition

Amount of assets held-for-sale that are not part of a disposal group.

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-Publisher FASB
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- Definition

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

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-Name Accounting Standards Codification
-Topic 210
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- Definition

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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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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- Definition

Amount of interest capitalized during the period.

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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

No definition available.

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- Definition

The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

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.

+ References

No definition available.

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Summary of Significant Accounting Policies (Narrative) (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($) a	Sep. 30, 2018 USD ($) a	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Operating assets independent of the Operating Partnership		$ 0		$ 0
Useful life of property				40 years
Depreciation expense from operation		29,100,000	$ 25,900,000	$ 84,100,000	$ 76,400,000
Real estate cost capitalized excluding interest cost		4,500,000	3,600,000	11,700,000	9,500,000
Real estate interest cost capitalized incurred		6,700,000	3,600,000	18,100,000	9,900,000
Gain / Loss on sale of equipment		0
Loss associated with assets held for sale		$ 3,300,000	0	$ 7,600,000	0
Number of reporting units \| item				1
Term Loan Maturing 2025
Summary Of Significant Accounting Policies [Line Items]
Interest rate		4.75%		4.75%
Other Assets.
Summary Of Significant Accounting Policies [Line Items]
Loss associated with assets held for sale		$ 2,200,000		$ 2,200,000
Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation		25,800,000	22,600,000	74,400,000	66,100,000
Non-Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation		$ 3,300,000	3,300,000	$ 9,700,000	10,300,000
Land in Manassas, Virginia \| Construction in Progress
Summary Of Significant Accounting Policies [Line Items]
Acres of land \| a	61	57
Payments to Acquire Land	$ 24,600,000	$ 12,300,000
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
Restructuring Charges [Member]
Summary Of Significant Accounting Policies [Line Items]
Gain / Loss on sale of equipment		(2,800,000)	$ 0		$ 0
Loss associated with assets held for sale		$ 4,100,000