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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Related party transactions
Interest expense, related party	$ 16,743	$ 14,254	$ 19,413
Loans to unconsolidated joint ventures	3,995	3,095
Due from affiliates	3,387	6,599
Unconsolidated joint ventures
Related party transactions
Management Fees	26,838	26,781	24,323
Development and Leasing Fees	9,955	11,488	9,228
Fees charged to unconsolidated joint ventures and third-party managed properties	36,793	38,269	33,551
Interest income, related party	276	184	46
Northwestern Mutual Life ("NML")
Related party transactions
Interest expense, related party	16,743	14,254	19,413
Interest expense payable, related party	$ 1,379	$ 1,439

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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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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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Revenues, net of returns and allowances, realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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