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Acquisitions - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended
	Feb. 17, 2015	Oct. 31, 2014	Mar. 31, 2016
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			$ 23,459
Acquisition noncontrolling interest adjustment			$ 76,141
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 (as a percent)	50.00%
Ownership interest at completion of acquisition (as a percent)	100.00%

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

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