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Mortgage Loans Payable And Unsecured Credit Facilities (Narrative) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 03, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 26, 2016 | Feb. 05, 2015
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unsecured revolving credit facility financing costs |  | $ 3,210,000 |  |  |  |
Payments of early extinguishment of debt costs |  | 2,623,000 | $ 105,000 | $ 825,000 |  |
Mortgage loan payable |  | 610,288,000 |  |  |  |
Other assets and deferred charges, net |  | 29,506,000 | 29,196,000 |  |  |
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings |  | 3,000,000 |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate swaps liability |  | 2,300,000 |  |  |  |
Cash Flow Hedging, Count 3 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Other assets and deferred charges, net |  | 3,100,000 |  |  |  |
Secured Debt [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage loan payable |  | $ 28,661,000 |  |  |  |
Secured Debt [Member] | Franklin Village Plaza [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Secured mortgage loan payable refinanced | $ 40,300,000 |  |  |  |  |
Mortgage loan payable | $ 50,000,000 |  |  |  |  |
Mortgage interest rate | 3.90% |  |  |  |  |
Mortgage maturity date |  | Jun. 30, 2026 |  |  |  |
Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 310,000,000
Aggregate borrowing capacity including increase under accordion feature |  | $ 750,000,000 |  |  |  |
Term loan amount |  | 150,000,000 |  |  |  | 100,000,000
Continuing Operations [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unsecured revolving credit facility financing costs |  | 3,210,000 | 3,202,000 |  |  |
Payments of early extinguishment of debt costs |  | 2,600,000 | 100,000 |  |  |
Mortgage loan payable |  | 610,288,000 | $ 676,779,000 |  |  |
Mortgage Loans Payable [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unsecured revolving credit facility financing costs |  | 900,000 |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unsecured revolving credit facility financing costs |  | $ 2,300,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility expiration date |  | Feb. 05, 2019 |  |  |  |
Extension period |  | 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] |  |  |  |  |  |
Mortgage loan payable |  | $ 72,000,000 |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | 260,000,000
Remaining borrowing capacity |  | $ 168,000,000 |  |  |  |
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 |  | Feb. 05, 2020 |  |  |  |
Term Loan Maturing February 11, 2019 [Member] | Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage maturity date |  | Feb. 11, 2019 |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |  |  |
Term loan amount |  | $ 75,000,000 |  |  |  |
Debt term |  | 5 years |  |  |  |
Weighted-average interest rate |  | 2.90% |  |  |  |
Term Loan Maturing February 11, 2019 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |  |  |
Term Loan Maturing February 11, 2019 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.90% |  |  |  |
Term Loan Maturing February 11, 2021 [Member] | Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage maturity date |  | Feb. 11, 2021 |  |  |  |
Basis spread on borrowings variable rate |  | 1.70% |  |  |  |
Term loan amount |  | $ 75,000,000 |  |  |  |
Debt term |  | 7 years |  |  |  |
Weighted-average interest rate |  | 4.00% |  |  |  |
Term Loan Maturing February 11, 2021 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.70% |  |  |  |
Term Loan Maturing February 11, 2021 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 2.30% |  |  |  |
Term Loan Maturing February 5, 2020 [Member] | Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage maturity date |  | Feb. 05, 2020 |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |  |  |
Term loan amount |  |  |  |  |  | $ 50,000,000
Debt term |  | 5 years |  |  |  |
Weighted-average interest rate |  | 2.80% |  |  |  |
Term Loan Maturing February 5, 2020 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |  |  |
Term Loan Maturing February 5, 2020 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.90% |  |  |  |
Term Loan Maturing February 5, 2022 [Member] | Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage maturity date |  | Feb. 05, 2022 |  |  |  |
Basis spread on borrowings variable rate |  | 1.55% |  |  |  |
Term loan amount |  | $ 50,000,000 |  |  |  |
Debt term |  | 7 years |  |  |  |
Weighted-average interest rate |  | 3.30% |  |  |  |
Term Loan Maturing February 5, 2022 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.55% |  |  |  |
Term Loan Maturing February 5, 2022 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 2.15% |  |  |  |
Term Loan Maturing April 26, 2023 [Member] | Unsecured credit facility [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Mortgage maturity date |  | Apr. 26, 2023 |  |  |  |
Basis spread on borrowings variable rate |  | 1.65% |  |  |  |
Term loan amount |  |  |  |  | $ 100,000,000 |
Weighted-average interest rate |  | 3.20% |  |  |  |
Term Loan Maturing April 26, 2023 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on borrowings variable rate |  | 1.65% |  |  |  |
Term Loan Maturing April 26, 2023 [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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