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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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related Party Arrangements
Compensation expense			$ 15,189	$ 13,245
Unconsolidated real estate entities
Related Party Arrangements
Outstanding receivables	$ 2,966		2,966		$ 2,449
Non Employee Director \| Restricted stock and deferred stock awards
Related Party Arrangements
Compensation expense	454	$ 368	1,200	$ 1,127
Amount of deferred compensation	$ 928		$ 928		$ 525