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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loans Payable Repaid) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Principal Payoff Amount | $ 114,828,000 | $ 161,094,000
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 | Jun. 05, 2014
Principal Payoff Amount | $ 41,327,000 | $ 11,217,000
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 |
Virginia Little Creek [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Feb. 03, 2014
Principal Payoff Amount |  | $ 295,000
Upland Square [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Feb. 11, 2014
Principal Payoff Amount |  | $ 57,839,000
Kings Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Apr. 01, 2014
Principal Payoff Amount |  | $ 7,188,000
Coliseum Marketplace [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Apr. 01, 2014
Principal Payoff Amount |  | $ 11,045,000
Liberty Marketplace [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Apr. 01, 2014
Principal Payoff Amount |  | $ 8,171,000
Trexler Mall [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | May 11, 2014
Principal Payoff Amount |  | $ 19,479,000
Yorktowne Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Jun. 02, 2014
Principal Payoff Amount |  | $ 18,726,000
Fieldstone Marketplace [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Jul. 11, 2014
Principal Payoff Amount |  | $ 16,878,000
Mechanicsburg Center [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Aug. 01, 2014
Principal Payoff Amount |  | $ 8,215,000
Smithfield Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Oct. 21, 2014
Principal Payoff Amount |  | $ 6,616,000
Elmhurst Square [Member] |  |
Debt Instrument [Line Items] |  |
Repayment Date |  | Dec. 11, 2014
Principal Payoff Amount |  | $ 3,638,000

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