Summary of Significant Accounting Policies (Segment Information to Taxes) (Details)	3 Months Ended
Mar. 31, 2020 customer subsidiary segment	Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Number of subsidiaries taxed as taxable REIT subsidiaries. \| subsidiary	2
Number of taxable REIT subsidiaries in a net deferred tax liability position \| subsidiary	1
Effective tax rate	13.00%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue associated with customers requesting payment relief	5.00%
Customer One \| Rental Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage	10.80%
Number of customers \| customer	1
Four Customers [Member] \| Accounts Receivable \| Trade Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage	22.00%
Number of customers \| customer	4
Four Customers [Member] \| Accounts Receivable \| Minimum \| Trade Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage	5.00%
Taxable REIT Subsidiaries [Member]
Summary Of Significant Accounting Policies [Line Items]
Effective tax rate		(6.30%)

Percentage of revenue associated with customers requesting payment relief.

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Number of customers.

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- Definition

Number of subsidiaries taxed as taxable REIT subsidiaries.

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Number of taxable REIT subsidiaries in a net deferred tax liability position.

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Summary Of Significant Accounting Policies [Line Items]

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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