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Acquisitions - Reconciliation of Purchase Price (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 17, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Acquisition
Carrying value of investment		$ 1,766,330		$ 1,766,330		$ 1,532,552
Gain on remeasurement of assets		$ 0	$ (14)	$ 0	$ 22,089
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
Ownership interest at completion of acquisition (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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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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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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