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Mortgage Loans Payable and Credit Facility (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Jul. 24, 2018 | Dec. 31, 2017
Line Of Credit Facility [Line Items] |  |  |  |  |
Payments of early extinguishment of debt costs |  | $ 4,829,000 | $ 4,829,000 |  |
Other assets and deferred charges, net |  | 50,645,000 | 50,645,000 |  | $ 35,350,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings |  |  | 2,600,000 |  |
Interest Rate Swap [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Derivative, notional amount |  | 425,000,000 | 425,000,000 |  | $ 350,000,000
Cash Flow Hedging, Count 3 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Other assets and deferred charges, net |  | 15,800,000 | $ 15,800,000 |  |
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] |  |  |  |  |
Line of credit facility extension allowed period | 1 year |  | 1 year |  |
Basis spread on borrowings variable rate |  |  | 1.35% |  |
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 |  |  |  |
Remaining borrowing capacity |  | $ 135,100,000 | $ 135,100,000 |  |
Term loan facility [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Basis spread on borrowings variable rate |  |  | 1.30% |  |
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 |  |  |  |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Loan maturity date |  |  | Jul. 24, 2018 |  |
Term loan amount |  |  |  | $ 75,000,000 |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Basis spread on borrowings variable rate |  |  | 1.70% |  |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Basis spread on borrowings variable rate |  |  | 2.25% |  |

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