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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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