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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Related party transactions
Interest expense, related party	$ 3,833	$ 4,086	$ 7,773	$ 8,575
Loans to unconsolidated joint ventures	3,403		3,403		3,995
Due from affiliates	3,572		3,572		3,387
Unconsolidated joint ventures
Related party transactions
Interest income, related party	64	49	129	143
Northwestern Mutual Life ("NML")
Related party transactions
Interest expense, related party	3,940	4,489
Interest expense payable, related party	1,275		1,275		1,379
Unconsolidated joint ventures and third-party managed properties
Related party transactions
Management Fees	5,861	6,549	11,909	12,811
Development and Leasing Fees	3,631	1,361	6,854	3,752
Fees charged to unconsolidated joint ventures and third-party managed properties	$ 9,492	$ 7,910	$ 18,763	$ 16,563

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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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