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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Related party transactions
Interest expense, related party	$ 3,815	$ 4,081	$ 11,588	$ 12,656
Loans to unconsolidated joint ventures	3,334		3,334		3,995
Due from affiliates	7,595		7,595		3,387
Unconsolidated joint ventures
Related party transactions
Interest income, related party	63	67	191	210
Northwestern Mutual Life ("NML")
Related party transactions
Interest expense, related party	3,815	4,081	11,588	12,656
Interest expense payable, related party	1,270		1,270		1,379
Unconsolidated joint ventures and third-party managed properties
Related party transactions
Management Fees	5,861	6,661	17,862	19,472
Development and Leasing Fees	3,677	2,344	9,764	6,094
Fees charged to unconsolidated joint ventures and third-party managed properties	$ 9,538	$ 9,005	$ 27,626	$ 25,566

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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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