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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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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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