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Mortgage Loans Payable and Credit Facility (Narrative) (Details) |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 08, 2017 USD ($) Loan | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Line Of Credit Facility [Line Items] |  |  |
Number of amended and restated existing unsecured term loans | Loan | 4 |  |
Other assets and deferred charges, net |  | $ 35,421,000 | $ 29,506,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings |  | 1,200,000 |
Interest Rate Swap [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Fair value of interest rate swaps included in accounts payable and accrued liabilities |  | 1,400,000 |
Derivative, notional amount |  | 350,000,000 | $ 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 |  | $ 3,600,000 |
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 |  | $ 143,400,000 |
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 |  |

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