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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 The expiration, mandatory redemption, or due date, month and year (YYYY-MM), of the financial instrument issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition 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 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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