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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Unconsolidated joint ventures	Mar. 31, 2011 Unconsolidated joint ventures	Sep. 30, 2011 Unconsolidated joint ventures	Sep. 30, 2010 Unconsolidated joint ventures	Mar. 31, 2012 Northwestern Mutual Life ("NML")	Mar. 31, 2011 Northwestern Mutual Life ("NML")	Dec. 31, 2011 Northwestern Mutual Life ("NML")
Related party transactions
Management Fees				$ 6,082	$ 6,263
Development and Leasing Fees				3,224	2,384
Fees charged to unconsolidated joint ventures and third-party managed properties				9,306	8,647
Interest expense, related party	3,940	4,489						3,940	4,489
Interest expense payable, related party								1,281		1,379
Loans to unconsolidated joint ventures	3,300		3,995
Interest income, related party				65	94	210	234
Due from affiliates	$ 4,991		$ 3,387

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