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Related Party Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Arrangements
Management, development and other fees	$ 1,231	$ 912	$ 3,484	$ 2,752
Compensation expense			20,291	15,189
Unconsolidated real estate entities
Related Party Arrangements
Outstanding receivables	2,901		2,901		$ 2,519
Non Employee Director | Restricted stock and deferred stock awards
Related Party Arrangements
Compensation expense	458	$ 454	1,288	$ 1,200
Amount of deferred compensation	$ 953		$ 953		$ 571

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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- Definition

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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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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