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Dispositions: (Details) $ in Thousands										6 Months Ended
	Dec. 29, 2014 USD ($) ft²	Oct. 31, 2014 USD ($) ft²	Oct. 10, 2014 USD ($)	Sep. 11, 2014 USD ($)	Aug. 28, 2014 USD ($)	Jul. 07, 2014 USD ($)	Mar. 17, 2014 USD ($) ft² note	Feb. 14, 2014 USD ($) ft²	Jan. 15, 2014 USD ($) ft²	Jun. 30, 2015 USD ($) ft²	Jun. 30, 2014 USD ($)
Discontinued Operations:
Gains (Losses) on Extinguishment of Debt										$ 636	$ (358)
Camelback Colonnade
Discontinued Operations:
Property area (in square feet) | ft²	619,000
Proceeds from sale	$ 92,898
Gain (loss) from sale	$ 24,554
Percentage of loan assumed by third party (as a percent)	67.50%
Cash payment	$ 61,173
Assumption of debt	31,725
Notes payable discharged	47,946
Noncontrolling interest adjustment	$ 17,217
Rotterdam Square
Discontinued Operations:
Property area (in square feet) | ft²									585,000
Proceeds from sale									$ 8,500
Gain (loss) from sale									$ (472)
Somersville Town Center
Discontinued Operations:
Property area (in square feet) | ft²								348,000
Proceeds from sale								$ 12,337
Gain (loss) from sale								$ (263)
Lake Square Mall
Discontinued Operations:
Property area (in square feet) | ft²							559,000
Proceeds from sale							$ 13,280
Gain (loss) from sale							(876)
Cash payment							$ 3,677
Lake Square Mall | Notes Receivable
Discontinued Operations:
Number of notes receivable (in notes) | note							2
Notes receivable							$ 9,603
Mervyn's
Discontinued Operations:
Proceeds from sale			$ 1,900	$ 1,200	$ 3,500	$ 3,560
Gain (loss) from sale			$ (3)	$ 315	$ (80)	$ (158)
South Towne Center
Discontinued Operations:
Property area (in square feet) | ft²		1,278,000
Proceeds from sale		$ 205,000
Gain (loss) from sale		$ 121,873
Great Northern Mall
Discontinued Operations:
Gains (Losses) on Extinguishment of Debt										$ 1,609
Great Northern Mall | Great Northern Mall
Discontinued Operations:
Property area (in square feet) | ft²										895,000
Gains (Losses) on Extinguishment of Debt										$ 1,609

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