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Subsequent Events: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended		0 Months Ended
	Sep. 30, 2011	Oct. 25, 2012 Subsequent event Dividend declared	Oct. 03, 2012 Subsequent event FlatIron Crossing squarefoot	Oct. 26, 2012 Subsequent event Arrowhead Towne Center squarefoot	Dec. 07, 2012 Subsequent event Forecast Dividend declared	Oct. 21, 2012 Subsequent event Forecast Kings Plaza squarefoot	Oct. 21, 2012 Subsequent event Forecast Green Acres Mall squarefoot
Subsequent events
Property square footage			1,481,000	1,196,000		1,200,000	1,800,000
Voting interest acquired (as a percent)			75.00%	33.30%
Purchase price on acquisition			$ 195,900	$ 144,400		$ 751,000	$ 500,000
Option to receive purchase price as unrestricted common shares							30,000
Purchase price funded by cash payment on acquisition				69,026
Purchase price paid through assumption of mortgage notes payable	$ 192,566		$ 126,795	$ 75,374
Dividend/distribution for common stockholders and OP Unit holders (in dollars per share)		$ 0.58
Percentage of dividend/distribution payable in cash					100.00%

X

- Definition

The portion of the cost of the acquired entity that may be paid as restricted shares of the acquirer's common stock, at the seller's option.

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Percentage of the cash component of the aggregate dividend declared (not including cash paid in lieu of fractional shares).

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Area of a real estate property.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Percentage of voting equity interests acquired in the business combination.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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