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Related Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Related party transactions
Interest expense, related party	$ 3,780	$ 3,940
Loans to unconsolidated joint ventures	3,366		3,345
Due from affiliates	31,197		17,068
Unconsolidated joint ventures
Related party transactions
Management Fees	5,493	6,082
Development and Leasing Fees	1,695	3,224
Fees charged to unconsolidated joint ventures and third-party managed properties	7,188	9,306
Interest income, related party	61	65
Due from affiliates	4,734		4,568
Northwestern Mutual Life ("NML")
Related party transactions
Interest expense, related party	3,780	3,940
Interest expense payable, related party	1,258		1,264
AWE Talisman
Related party transactions
Number of notes receivable	2
Interest income, related party	154	8
Due from affiliates	12,500		12,500
Interest rate (as a percent)	5.00%
RED Consolidated Holdings, LLC ("RED")
Related party transactions
Due from affiliates	$ 13,330
Interest rate (as a percent)	5.25%

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Revenue, comprised of fees related to the development and leasing of joint venture properties and third-party managed properties.

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Interest rate stated in the contractual debt agreement.

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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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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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