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Acquisitions - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	Aug. 19, 2016	Feb. 17, 2015	Oct. 31, 2014	Sep. 30, 2016	Sep. 30, 2016
Acquisition
Contingent consideration				$ 2,570	$ (12,180)
Inland Center
Acquisition
Purchase price		$ 51,250
Purchase price funded by cash payment on acquisition		26,250
Purchase price paid through assumption of debt by the Company		$ 25,000
Additional ownership interest acquired (percent)		50.00%
Ownership interest at completion of acquisition (percent)		100.00%
Fashion Outlets of Chicago | Affiliated Entity
Acquisition
Purchase price			$ 69,987
Purchase price funded by cash payment on acquisition			55,867
Purchase price paid through assumption of debt by the Company			$ 14,120
Contingent consideration	$ 23,800

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In a business combination achieved in stages, this element represents the additional percentage of equity interests acquired.

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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.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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