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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loans Payable Repaid) (Details) - Mortgage Loans Payable [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Gold Star Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Mar. 10, 2016 |
Principal payoff amount | $ 953,000 |
West Bridgewater [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Jun. 06, 2016 |
Principal payoff amount | $ 10,037,000 |
Hamburg Square [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Jul. 01, 2016 |
Principal payoff amount | $ 4,569,000 |
Meadows Marketplace [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Aug. 01, 2016 |
Principal payoff amount | $ 9,089,000 |
Carman's Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Aug. 01, 2016 |
Principal payoff amount | $ 33,500,000 |
San Souci Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Sep. 01, 2016 |
Principal payoff amount | $ 27,200,000 |
Camp Hill [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Sep. 30, 2016 |
Principal payoff amount | $ 60,742,000 |
Swede Square [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Dec. 29, 2016 |
Principal payoff amount | $ 9,652,000 |
Golden Triangle [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date | Dec. 30, 2016 |
Principal payoff amount | $ 18,496,000 |
New London Mall [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Feb. 01, 2015
Principal payoff amount |  | $ 27,365,000
Oak Ridge Shopping Center [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Mar. 11, 2015
Principal payoff amount |  | $ 3,155,000
Pine Grove Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Jun. 01, 2015
Principal payoff amount |  | $ 5,139,000
Quartermaster Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Jul. 01, 2015
Principal payoff amount |  | $ 41,327,000
Groton Shopping Center [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Jul. 01, 2015
Principal payoff amount |  | $ 10,953,000
Jordan Lane [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Aug. 02, 2015
Principal payoff amount |  | $ 11,682,000
Southington Center [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Aug. 02, 2015
Principal payoff amount |  | $ 5,129,000
Oakland Mills [Member] |  |
Debt Instrument [Line Items] |  |
Repayment date |  | Sep. 01, 2015
Principal payoff amount |  | $ 4,385,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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