Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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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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Related Party Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Arrangements
Management, development and other fees	$ 993	$ 1,320	$ 3,290	$ 4,310
Compensation expense			13,245	11,555
Unconsolidated real estate entities
Related Party Arrangements
Outstanding receivables	2,663		2,663		$ 5,239
Non Employee Director \| Restricted stock and deferred stock awards
Related Party Arrangements
Compensation expense	368	$ 260	1,127	$ 877
Amount of deferred compensation	$ 782		$ 782		$ 531