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Mortgage Loans Payable and Unsecured Credit Facility (Narrative) (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 29, 2020 | Aug. 04, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Line Of Credit Facility [Line Items] |  |  |  |
Credit facilities |  |  | $ 120,900,000 | $ 106,000,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings |  |  | 7,200,000 |
Interest Rate Swap [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Derivative, notional amount |  |  | $ 425,000,000.0 | $ 425,000,000.0
Unsecured Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity |  | $ 300,000,000 |  |
Aggregate borrowing capacity including increase under accordion feature |  | $ 750,000,000 |  |
Revolving Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility extension allowed period |  | 1 year | 1 year |
Basis spread on borrowings variable rate |  |  | 1.65% |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.35% |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.95% |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity | $ 44.1 |  |  |
Basis spread on borrowings variable rate | 1.65% |  |  |
Credit facilities | $ 185,000,000.0 |  |  |
Revolving Credit Facility [Member] | Unsecured Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity |  | $ 250,000,000 |  |
Credit facility expiration date |  | Sep. 08, 2021 |  |
Term loan facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  |  | 1.60% |
Term loan facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |
Term loan facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.90% |  |
Term loan facility [Member] | Subsequent Event [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate | 1.60% |  |  |
Term loan facility [Member] | Unsecured Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity |  | $ 50,000,000 |  |
Credit facility expiration date |  | Sep. 08, 2022 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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