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Acquisitions - Reconciliation of Purchase Price to Fair Value (Details) - USD ($) $ in Thousands				12 Months Ended
	Feb. 17, 2015	Nov. 14, 2014	Jun. 04, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquisition
Less debt assumed				$ 0	$ 0	$ (1,414,659)
Carrying value of investment				(1,773,558)	(1,532,552)
Gain on remeasurement of assets				$ 0	$ 22,089	$ 1,423,136
Cascade Mall
Acquisition
Purchase price			$ 15,233
Carrying value of investment			(15,767)
Fair value of acquired net assets (at 100% ownership)			$ 31,000
PPR Queens Portfolio
Acquisition
Purchase price		$ 1,838,886
Less debt assumed		(672,109)
Carrying value of investment		(208,735)
Gain on remeasurement of assets		1,423,136
Fair value of acquired net assets (at 100% ownership)		$ 2,381,178
Inland Center
Acquisition
Purchase price	$ 51,250
Less debt assumed	(25,000)
Carrying value of investment	(4,161)
Gain on remeasurement of assets	22,089
Fair value of acquired net assets (at 100% ownership)	$ 52,500

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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 recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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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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