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Mortgage Loans Payable and Unsecured Credit Facilities (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details)		3 Months Ended	12 Months Ended
	Sep. 08, 2017	Mar. 31, 2020	Dec. 31, 2019
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate			1.35%
Line of credit facility extension allowed period	1 year		1 year
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate	1.35%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate	1.95%
Revolving Credit Facility [Member] | Unsecured credit facility [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate		0.14%
Revolving Credit Facility [Member] | Unsecured credit facility [Member] | Minimum [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate		0.10%
Revolving Credit Facility [Member] | Unsecured credit facility [Member] | Maximum [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate		0.15%
Term Loan Four [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Expiration period			2020-02
Effective interest rate			3.20%

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- Definition

Line of credit facility extension allowed period.

+ References

No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

+ References

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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