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Mortgage Loans Payable And Unsecured Credit Facilities (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Feb. 05, 2015
Line of Credit Facility [Line Items] |  |  |
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings | $ 3,200,000 |  |
Interest Rate Swap [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Fair value of interest rate swaps included in accounts payable and accrued liabilities | 3,945,000 |  |
Unsecured Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing capacity |  |  | $ 310,000,000
Term loan amount | $ 150,000,000 |  | 100,000,000
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility borrowing capacity |  |  | 260,000,000
Credit facility expiration date | Feb. 05, 2019 |  |
Extension period | 1 year |  |
Aggregate borrowing capacity including increase under accordion feature | $ 750,000,000 |  |
Basis spread on borrowings variable rate | 1.35% |  |
Remaining borrowing capacity | $ 182,000,000 |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.35% |  |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.95% |  |
Term Loan [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.30% |  |
Term Loan [Member] | Unsecured Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility expiration date | Feb. 05, 2020 |  |
Term loan amount |  |  | 50,000,000
Term Loan [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.30% |  |
Term Loan [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.90% |  |
Term Loan Maturing February 11, 2019 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan amount | $ 75,000,000 |  |
Basis spread on borrowings variable rate | 1.30% |  |
Debt term | 5 years |  |
Loan maturity date | Feb. 11, 2019 |  |
Weighted-average interest rate | 2.90% |  |
Term Loan Maturing February 11, 2019 [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.30% |  |
Term Loan Maturing February 11, 2019 [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.90% |  |
Term Loan Maturing February 11, 2021 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan amount | $ 75,000,000 |  |
Basis spread on borrowings variable rate | 1.70% |  |
Debt term | 7 years |  |
Loan maturity date | Feb. 11, 2021 |  |
Weighted-average interest rate | 4.00% |  |
Term Loan Maturing February 11, 2021 [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.70% |  |
Term Loan Maturing February 11, 2021 [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 2.30% |  |
Term Loan Maturing February 5, 2020 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan amount |  |  | $ 50,000,000
Basis spread on borrowings variable rate | 1.30% |  |
Debt term | 5 years |  |
Loan maturity date | Feb. 05, 2020 |  |
Weighted-average interest rate | 2.80% |  |
Term Loan Maturing February 5, 2020 [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.30% |  |
Term Loan Maturing February 5, 2020 [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.90% |  |
Term Loan Maturing February 5, 2022 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan amount | $ 50,000,000 |  |
Basis spread on borrowings variable rate | 1.55% |  |
Debt term | 7 years |  |
Loan maturity date | Feb. 05, 2022 |  |
Weighted-average interest rate | 3.30% |  |
Term Loan Maturing February 5, 2022 [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 1.55% |  |
Term Loan Maturing February 5, 2022 [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on borrowings variable rate | 2.15% |  |
Continuing Operations [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Payments of early extinguishment of debt costs | $ 105,000 | $ 825,000 |

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