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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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