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Mortgage Loans Payable and Credit Facility (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 08, 2017 | Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Line Of Credit Facility [Line Items] |  |  |  |
Approximate amount of accumulated other comprehensive income to be reclassified into earnings |  |  | $ 1,400,000 |
Interest Rate Swap [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Derivative, notional amount |  |  | 425,000,000 | $ 425,000,000
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] |  |  |  |
Credit facility borrowing capacity |  |  | $ 116,000,000 |
Line of credit facility extension allowed period | 1 year |  | 1 year |
Basis spread on borrowings variable rate |  |  | 1.50% |
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] | Unsecured credit facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity | $ 250,000,000 |  |  |
Credit facility expiration date | Sep. 08, 2021 |  |  |
Basis spread on borrowings variable rate |  | 0.14% |  |
Revolving Credit Facility [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 0.10% |  |
Revolving Credit Facility [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 0.15% |  |
Term loan facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  |  | 1.45% |
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] | 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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